I was recently asked about how to use Compass in an existing CodeIgniter project. It seems that the emailer was under the impression that Compass was made for Ruby and Rails. But that's not the case at all! Note that Ruby will need to be installed on your system in order for Compass to work correctly.
The screencast (coming in at a quick five minutes) shows you how to get things set up and includes a walk-through of the generator application and the output it gives.