The more and more you can do with it, clearly it's becoming less and less domain-specific.

http://www.cssplay.co.uk/menu/amazing.html

or just google for hackernews posts like entirely in css, pure css, all in css, etc. Hell from a quick glance it seems that if you google for 'in css' half the posts on hackernews are like that...

http://y.ww.com/item?id=2636440

It's not hard to see where this is going...