I'd like to see fewer forums, not more. KDE and Palm OS should definitely go (KDE most certainly isn't an OS and Palm really isn't in the context of Maemo). Android, Debian and Ubuntu are also mostly pointless (Deblet is unmaintained, Ubuntu doesn't have much Maemo-specific and I don't think any of them really get enough traffic to justify another subforum). You could Make a case for Mer, though that'd probably be better off another level up.