S2 (the replacement style system talked about for the past few years) lives and is entirely complete now in FotoBilder, which PicPix.com is running.
All that remains is writing documentation (or really, merging all the misc docs into something cohesive) and eventually getting developers exciting about it.
The excitement generation can wait a bit, but if you're wanting to get started, here are some initial docs:http://www.picpix.com/doc/s2.html
You'd need a PicPix.com account to test, unless you're running your own FotoBilder installation.
However, never fear --- mart
has already made the first draft of the core layer for LiveJournal, so we should be having some S2 fun here in LJ land soon.