Man, so many games it's hard to even start a list. There's a "100 top 2600 games" thread over at Atari Age, that'd be a good place to start:
http://www.atariage.com/forums/topic...s-of-all-time/
Personally, most Imagic games are awesome (Demon Attack, Atlantis, Dragonfire, Cosmic Ark, etc). I like a lot of Atari games (Asteroids, Space Invaders, Ms. Pac Man, Phoenix, Millipede, Vanguard, Yar's Revenge, Adventure) and Activision (Pitfall, Kaboom!, Keystone Kapers, River Raid) games. I also like a lot of Apollo games (Space Cavern, Infiltrate). The list of awesome 2600 titles is long...![]()