Since I’ve just upgraded to Ubuntu Breezy (the next release of Ubuntu, currently a preview release) I’ve installed tomboy. It’s like a Wiki for your desktop. Awesome. Seems to be pretty useful. Even more useful than the stickynotes applet. In fact, i think I’ll remove sticky notes.
The storage format for tomboy is a lot more resiliant as well. A file-per-note instead of one large XML file.
One day I’ll go through a bunch of GNOME apps and fix their file system code so that it becomes near impossible to loose data with unexpected reboots.
I have special hate for the stickynotes applet. I use Tomboy personally. If you want to hack on stickynotes, feel free. People have been talking about exciting ideas, just no one has gotten around to coding them.