I think it would be a good idea to have a list with all the feeds that work with rc10 here:
So If you know of any, please add them in this thread with a short description.
I'll just start here:
http://egbok.com/Zaurus/pdaXrom/unstable/feed - contains nonpareil, the ultimate hp calculator emulator
http://beer.geek.nz/software/zaurus/feed/unstable/ - contains burgerspace, mutt, gnupg, rsync and putty