As part of Atari's 40th birthday, the publisher just announced an interesting promotion that lets you grab all of its classic game ports for the iPhone and iPad totally free of charge.
The Atari's Greatest Hits app has always been a free download, but each of a hundred Atari 2600 and arcade games found in this collection is normally a paid download through in-app purchases (except Missile Command).
You don't want to pass on this one, but there are some caveats you should know about...