Full Screen
Magic Marker
Word Search
Draw and Share
Meebo IM
Color Flashlight - not sure this is useful for anything but it works
Thinking Space - mind maps
Toggle Settings - control WiFi, Brightness etc.
Arity Calculator
Note Everything, superb - does voice, handwritten and text.
Note Everything Google Docs - integrates with Google Docs and allows upload and download.

I use Astro File Manager to backup my apps, then I either copy the .apk to my SD card or email it to myself. Works great!

In Small Window
TTS Service Extended - makes it talk
Voice Dictionary - Translates
OI Safe - password manager - automatically takes you to web page and logs you in.
OI Timer - countdown timer