CSS is cool. I restructured the html on my main site to be friendly for doing entire “rethemes” using only css. I have 2 themes currently, and a javascript theme switcher that uses functions borrowed from this article over at A List Apart. A List Apart is one of the best sites for learning about standards compliant web design and best practices. I highly recommend reading it, I have been reading it for years.
Back to the topic of CSS stuff, I want to use Sandbox-10 for my WP theme. I have it installed on this server, but I haven’t had the time to do a stylesheet for it yet. I’ll make a few good ones sometime soon.