Ahh, Atari. Long before PlayStation, XBOX and Wii there was Atari. While many of the Atari franchise games have been re-released over the years, they've not quite may their way to Android. That all changed a few days ago with the release of Atari's Greatest Hits in the Android Market.
As a starter, you get Missile Command for free when you download the app and other classics such as Asteroids, Centipede, Gravatar and many others are supported through the in-app purchasing options as game packs. Each game pack will cost you $.99 or if you're looking to go all in, you can purchase all 100 games for $10. The full list is available in the Android Market.
Personally, I went with the $10 for 100 -- It's cheaper that way and you'll never have to worry about buying a game pack for $.99 and only getting one game you like but to each their own. If you dig old school gaming as much as I do, go ahead and jump past the break for the download. Be warned though, you may have to excuse yourself from any plans you made previously.