Switches for wheelchair users and other disabled uses.
A remote control for Android that allows the entire device to be operated with as little as a single switch.
Download maps for the Map application on the N810 tablet without using the in-built software. Very useful. :-)
A bloody handy little perl script called tablet-encode which automatically transcodes video files into a good format for the Nokia tablets. Even has a GUI (which doesn't work for me) through gtk2-perl. :)