A To Do or Task program that is exactly like the ones I had when I owned the Palm PDAs. It was just great. It had a check box, date due, description, categories, priority. Best of all you could list the task based on these factors.

Yes there are many out and I am currently use Pockey Diary List but it's still too bloated for me. RIM's original supplied one is too simplistic on the other end of the spectrum.