SDOM 0.4.1 is out! New stuff includes DTD and entity parsing, which makes document normalization actually work the way it's supposed to (though you'll need 0.1.3 or later of wingo's guile-lib to really see the benefit). Grab the tarball from http://www.nongnu.org/sdom/. Focus for the next release is, I think, going to be on the events subsystem and the documentation.
For the moment, though, back to SCSS and libRUIN for a little while.