SCSS 0.3.0 is out -- I completely rewrote the grammar, mostly so that I could make the parsing system a bit more... reentrant for error-handling purposes. The S-exprs used to represent stylesheets are now very similar to the ones that WebIt! uses, though there are some incompatibilities when it comes to CSS2.1-specific stuff. And there's some other stuff, too. The NEWS file in the distribution will fill you in. Tarballs are at http://www.nongnu.org/scss/

For the next release, I'd like to improve the performance a bit more -- I feel like using regexps for validating and querying style values is overkill in most cases, though in others it's practically necessary. So... not sure what I'm going to do about that. I'd also like to add SAC support, but there may be some linguistic / architectural hurdles there.