We have mentioned the free BBNotepad application a few times on BerryReview. It is essentially a text editing software that can open & save most regular text files from your SD or device memory.
Tom just let me know that the developer updated the application with a feature many people were requesting. As of version 1.1.2 you can now save and read to the native RIM memo application from BBNotepad. This is great for people who are on BES or sync regularly since the changes will then be on your desktop too.