As I've said before (in another thread), selecting all repositories is probably not a good idea. You end up with random repositories which can conflict with each other and cause problems. Try cutting down your repositories to just the ones included on the tablet and "Maemo Extras" then try seeing what packages are available. If that doesn't get you anywhere, post the log up here. (menu > tools > log ...). It's hard for anyone to help without more details.

-John