Compass is a CSS Meta-Framework that is ported to Sass to make them easier to configure and apply to your semantic markup. It stands-alone via a simple command-line interface and ready to use in your ruby-based web application.

Best Practices of Compass CSS Framework:

* Use a Base stylesheet file – Create a _base.sass partial to initialize your stylesheets with common variables and the framework utilities you plan to use.

* Write your own Custom Mixins – Mixins let you insert any number of style rules into a selector (and its descendants!) with a single line.

It is not only a collection of classes, because you still can use the best of breed css frameworks such as: blueprint, yui, and 960. So visit the Compass CSS Framework site to learn more!