A great example of the kind of styles Enyo uses:

http://enyojs.com/samples/stylematters/

Seriously beautiful. Next chance I get, I'm going to get to grips with Enyo- it looks fantastic.

looks like it has a lot of similarities (philosophically) with Google's Closure Library:

http://code.google.com/closure/library/

The latter's compability with the advanced mode of the closure compiler make it more appealing to me though.