Vectoroids would be lots of fun if there was a way to remap the fire button to something other than the space bar. I bet it works well on the N810.

EDIT: I'm going to do some experimenting with xmodmap and xbindkeys to see if I can remap the N800 keys to be more useful for Debian programs. Should be interesting. (I confess, I'm adding this edit so I can use this post as reference for those two posts, oh and the xbindkeys info and some xmodmap info too )