Uit Rob Howard's blog: 

Today we’re proud to announce the immediate availability of Community Server 2007 – the best version of Community Server yet!

There are a number of new improvements, but by far the largest is the new theme system “Chameleon”. Chameleon allows people to change the look-and-feel of Community Server without requiring a degree in Computer Science! There are simple to use what-you-see-is-what-you-get tools to assist you in changing colors, graphics, fonts, and more. Also sharing themes has never been easier – Community Server uses a single-file for exporting or importing all of its theme settings, which means you can quickly share your themes with your friends.