http://ride4.org/shai.xml
This source has a lot of sources in it. It literally doubles to triples the size of the all packages list in Installer. Add to source, go to install, then install it (under Sources > All Sources). Then if there's any sources you don't want, you can remove them individually.
Also, I'm not sure if the above source has this source in it, but if you want good themes use
http://www.touchrepo.com/repo.xml