I wish the sale would have gone on a couple more days so I could hit it again, but while gamestop was running it's B2G1 Free promo on used games, I picked up a decent stack, and from the reviews I've read, already put together a nice library for the PSP I got for Christmas.
I got:
Daxter, Mega Man: Powered Up, Mega Man: Mavrick Hunter, Death Junior,
Tokobot, Coded Arms, Cube, Lumines 2, Me and My Katamari and Castlevania: Dracula X Chronicles.
I think if I'd have been able to get back, I'd have then gotten Metal Gear Portable Ops, GTA Liberty City stories and Patapon.
Definitely go pick up Daxter if there is a gamestop near you. It's most definitely worth $5.