Cruncheee: Installed to my SD card, but then was obliterated by me trying to boot while the "Lock" switch was on.
Ubuntu: After my failure with Cruncheee, I decided to just try regular old Ubuntu.
Jolicloud [4-10 to 5-10]: Ubuntu started to slow down and dissapoint me, so I moved to Jolicloud, also for fun.
MeeGo [5-10 to 6-10]: Jolicloud also started to slow down slightly, but the main reason was because I kept getting low disk notifications.....without even having a Swap.
TinyCore [6-10]: MeeGo basically just started crashing and acting unreliable. But TinyCore lasted all of 2-3 days...
Peppermint [6-10-CURRENT]: Just got tired of having to load/unload programs. Also lost a backup which made me lose alot of data concerning program preferences.
Other possibilities: Crunchbang (again), Kuki (when it supports Eee's), fluxflux-sl, Slitaz, and ReactOS.
OTHERS I TRIED BUT DIDN'T INSTALL: EasyPeasy, Ubuntu Netbook Remix, and fluxflux-eee (though I came close).
Giving my netbook a bad case of amnesia fairly frequently,