Ben Tiedt did a great job introducing theming Community Server with Chameleon at the Community Server Developer's Conference - and we got video. It's long but great! If you want to build a custom theme or tweak your existing UI, this is a great video to spend some time with.
You can also buy the book about building custom themes in Community Server: Professional Community Server Themes by Wyatt Preul and Ben Tiedt. The book covers URL rewriting, theme creation, Chameleon controls, dynamic configuration, and other theme-related topics. You can buy it now on Amazon.com or BarnesAndNoble.com.
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