Flashgames247.com has a bunch of games (there's even download links for some at http://flashgames247.com/pages/freegames.html).

Unfortunately, the BikeMania saga is to slow to play on the N180. Bummer, I love those.

One that I was hoping worked is this one: http://adamatomic.com/canabalt/. Oh well, maybe it's for the best, it's too addictive.