A "work in progress" (ie. not yet ready for prime-time) minifier/preprocessor for CSS:

• parses CSS from multiple files, including a limited form of inheritence to enable base stylesheets to be used intelligently

• can emit warnings when encountering invalid CSS

• accepts "colour" and "background-colour" properties for people that habitually spell correctly

• optimises output CSS files by omitting unnecessary source elements such as comments, non-significant whitespace and redundant rules

• useful preprocessing features, such as

  • different block-level and line-level comment styles
  • reusable definitions
  • automatic expansion of commonly replicated CSS rules (eg. border-radius, -moz-border-radius, -webkit-border-radius)