Cool thing is people are still making games for Atari 2600, Intelivision and Colecovision. Over at www.atariage.com
, they just released a Super Mario Brothers clone for the Atari 2600! It's got all the levels of the original game and is fairly accurate for the 2600. Pac-man 4k was also released. This is a remake of the Atari 2600 version but way more accurate but the same size cartridge. Also don't forget Halo 2600 written by Ed Fryes!