This plugin is based on lessphp, a compiler for LESS written in PHP. LESS extends CSS with variables, mixins, operations and nesting.
More information about LESS syntax:
What it does:
The plugin will look for .less files in your theme (skin) folder, as well as its /css subdirectory. It will compile any .less files it finds to the .css counterpart (using the same filename), but only if the file doesn't exist yet or...