Sass Utility Mixins that encapsulate many common styling patterns. Using them can significantly speed up the styling of a webpage.

Here's a quick rundown of what's included in this checkin (@ denotes an import file, + denotes a mixin):

@ compass/utilities
  @ compass/utilities/general
    @ compass/utilities/general/clearfix
      +clearfix - Clearing floats without extra markup
    @ compass/utilities/general/tag_cloud
      +tag-cloud(!base_size = 1em) - Emits styles for a tag cloud
  @ compass/utilities/links
    @ compass/utilities/links/hover_link
      +hover-link - makes a link underlined only when hovered.
    @ compass/utilities/links/link_colors
      +link-colors(!normal, [!hover, !active, !visited, !focus]) - specify all the colors
        of a link with one mixin. Colors not sepecified will not be emitted, this may or
        may not work out depending on how you've defined your style rules.
    @ compass/utilities/links/unstyled_link
      +unstyled-link - A link that looks and acts like the text it is contained within
  @ compass/utilities/lists
    @ compass/utilities/lists/bullets
      +no-bullet - Turns off the bullet for a single list element.
      +no-bullets - Turns off the bullets for all the list elements in a list.
      +pretty-bullets(!bullet_icon, !width, !height[, !line_height = 18px, !padding = 14px]) - use an icon for the list elements of a list.
    @ compass/utilities/lists/horizontal_list
      +horizontal-list - A list where the elements are floated left.
    @ compass/utilities/lists/inline_list
      +inline-list - A list where both the list and the list elements are inlined.
      +comma-delimited-list - an inline-list that is comma delimited.
  @ compass/utilities/tables
    @ compass/utilities/tables/alternating_rows_and_columns
      +alternating-rows-and-columns(!even_row_color, !odd_row_color, !dark_intersection) - The first colors are the even/odd colors respectively and the last argument is a shade that is subtracted from those colors for the even columns.
  @ compass/utilities/text
    @ compass/utilities/text/nowrap
      +nowrap - Because remembering whether or not there's a hyphen in white-space is too hard

frameworks/blueprint/stylesheets/blueprint/modules/_grid.sass

@@ -15,7 +15,7 @@
 //  * subtraction.com/archives/2007/0318_oh_yeeaahh.php
 //  --------------------------------------------------------------
 
-@import compass/utilities
+@import compass/utilities/general/clearfix
 
 // Main layout grid, edit these parameters to build your grid and container sizes.
 !layout_grid_columns = 24

frameworks/compass/stylesheets/compass/_utilities.sass

@@ -1,16 +1,5 @@
-// Clearing floats without extra markup
+@import utilities/general
-// Based on How To Clear Floats Without Structural Markup by PiE
+@import utilities/links
-// [http://www.positioniseverything.net/easyclearing.html]
+@import utilities/lists
-// The above article no longer recommends its approach instead
+@import utilities/tables
-// This is recommended now:
+@import utilities/text
-// [http://www.sitepoint.com/examples/clearing_floats/example2.php]
-=clearfix
-  :overflow auto
-  // This makes ie6 get layout
-  :display inline-block
-  // and this puts it back to block
-  &
-    :display block
-
-=nowrap
-  :white-space nowrap

frameworks/compass/stylesheets/compass/utilities/_general.sass

@@ -0,0 +1,3 @@
+@import general/clearfix
+@import general/tag_cloud
+

frameworks/compass/stylesheets/compass/utilities/_links.sass

@@ -0,0 +1,3 @@
+@import links/hover_link
+@import links/link_colors
+@import links/unstyled_link

frameworks/compass/stylesheets/compass/utilities/_lists.sass

@@ -0,0 +1,3 @@
+@import lists/horizontal_list
+@import lists/inline_list
+@import lists/bullets

frameworks/compass/stylesheets/compass/utilities/_tables.sass

@@ -0,0 +1 @@
+@import tables/alternating_rows_and_columns

frameworks/compass/stylesheets/compass/utilities/_text.sass

@@ -0,0 +1 @@
+@import text/nowrap

frameworks/compass/stylesheets/compass/utilities/general/_clearfix.sass

@@ -0,0 +1,10 @@
+// Clearing floats without extra markup
+// Simple Clearing of Floats
+// [http://www.sitepoint.com/blogs/2005/02/26/simple-clearing-of-floats/]
+=clearfix
+  :overflow auto
+  // This makes ie6 get layout
+  :display inline-block
+  // and this puts it back to block
+  &
+    :display block

frameworks/compass/stylesheets/compass/utilities/general/_tag_cloud.sass

@@ -0,0 +1,19 @@
+// Emits styles for a tag cloud
+=tag-cloud(!base_size = 1em)
+  :font-size= !base_size
+  :line-height= 1.2 * !base_size
+  .xxs, .xs, .s, .l, .xl, .xxl
+    :line-height 1.2 !base_size
+  .xxs
+    :font-size= !base_size / 2.0
+  .xs
+    :font-size= 2.0 * !base_size / 3.0
+  .s
+    :font-size= 3.0 * !base_size / 4.0
+  .l
+    :font-size= 4.0 * !base_size / 3.0
+  .xl
+    :font-size= 3.0 * !base_size / 2.0
+  .xxl
+    :font-size= 2.0 * !base_size
+

frameworks/compass/stylesheets/compass/utilities/links/_hover_link.sass

@@ -0,0 +1,5 @@
+// a link that only has an underline when you hover over it
+=hover-link
+  :text-decoration none
+  &:hover
+    :text-decoration underline

frameworks/compass/stylesheets/compass/utilities/links/_link_colors.sass

@@ -0,0 +1,24 @@
+// Set all the colors for a link with one mixin call
+// Order of arguments is:
+// normal, hover, active, visited, focus
+// states not specified will inherit.
+// Mixin like so:
+// a
+//   +link-colors(#00c, #0cc, #c0c, #ccc, #cc0)
+
+=link-colors(!normal, !hover = false, !active = false, !visited = false, !focus = false)
+  :color= !normal
+  @if !visited
+    &:visited
+      :color= !visited
+  @if !focus
+    &:focus
+      :color= !focus
+  @if !hover
+    &:hover
+      :color= !hover
+  @if !active
+    &:active
+      :color= !active
+
+  

frameworks/compass/stylesheets/compass/utilities/links/_unstyled_link.sass

@@ -0,0 +1,5 @@
+// A link that looks and acts like the text it is contained within
+=unstyled-link
+  :color inherit
+  :text-decoration inherit
+  :cursor inherit

frameworks/compass/stylesheets/compass/utilities/lists/_bullets.sass

@@ -0,0 +1,21 @@
+// Turn off the bullet for an element of a list
+=no-bullet
+  :list-style-type none
+  :margin-left 0px
+
+// turns off the bullets for an entire list
+=no-bullets
+  li
+    +no-bullet
+
+// Make a list(ul/ol) have an image bullet
+// mixin should be used like this for an icon that is 5x7:
+// ul.pretty
+//   +pretty-bullets(/images/my-icon.png, 5px, 7px)
+=pretty-bullets(!bullet_icon, !width, !height, !line_height = 18px, !padding = 14px)
+  :margin-left 0
+  li
+    :padding-left= !padding
+    :background= url(!bullet_icon) no-repeat ((!padding - !width) / 2) ((!line_height - !height) / 2)
+    :list-style-type none
+

frameworks/compass/stylesheets/compass/utilities/lists/_horizontal_list.sass

@@ -0,0 +1,17 @@
+// A list(ol,ul) that is layed out such that the elements are floated left and won't wrap.
+// This is not an inline list.
+=horizontal-list
+  :overflow auto
+  :list-style-type none
+  :padding-left 0px
+  :margin 0px
+  li
+    :white-space nowrap
+    :float left
+    :padding
+      :left 4px
+      :right 4px
+    &.first
+      :padding-left 0px
+    &.last
+      :padding-right 0px

frameworks/compass/stylesheets/compass/utilities/lists/_inline_list.sass

@@ -0,0 +1,29 @@
+// makes a list inline.
+
+=inline-list
+  :list-style-type none
+  :margin 0px
+  :padding 0px
+  :display inline
+  li
+    :margin 0px
+    :padding 0px
+    :display inline
+
+// makes an inlin list that is comma delimited.
+// use of this recipe is not recommended at this time due to browser support issues.
+//
+// use of :content and :after is not fully supported in all browsers.
+// See http://www.quirksmode.org/css/contents.html#t15 for the support matrix
+//
+// :last-child is not fully supported
+// see http://www.quirksmode.org/css/contents.html#t29 for the support matrix
+
+=comma-delimited-list
+  +inline-list
+  li
+    &:after
+      :content ", "
+    &:last-child, &.last
+      &:after
+        :content ""

frameworks/compass/stylesheets/compass/utilities/tables/_alternating_rows_and_columns.sass

@@ -0,0 +1,25 @@
+=alternating-rows-and-columns(!even_row_color, !odd_row_color, !dark_intersection)
+  td,
+  th
+    :padding 2px
+    &.numeric
+      :text-align right
+  tbody
+    th
+      :text-align center
+  thead
+    :font-size .9em
+    th.even
+      :background-color= #fff - !dark_intersection
+  tfoot
+    :font-size .9em
+    td.even
+      :background-color= #fff - !dark_intersection
+  tr.odd
+    :background-color= !odd_row_color
+    td.even
+      :background-color= !odd_row_color - !dark_intersection
+  tr.even
+    :background-color= !even_row_color
+    td.even
+      :background-color= !even_row_color - !dark_intersection

frameworks/compass/stylesheets/compass/utilities/text/_nowrap.sass

@@ -0,0 +1,3 @@
+// When remembering whether or not there's a hyphen in white-space is too hard
+=nowrap
+  :white-space nowrap