I use TxtNotes for note taking and writing. The upside for me is that it saves notes as text files on my media card, so I can transfer my writing to my laptop and back again without much trouble.
Dollars 5 Complete » txtNotes for Blackberry 8800, 8300 and 8100
The program was developed for the 8xxx series handsets, but I have it on my Tour and it works as well as it did on my 8830.