Forgot to mention SCUMM games. If you like/or can get a hold of any point and click DOS games like Day of the Tentacle, Indiana Jones:The Fate of Atlantis, Sam and Max, etc. They work perfectly well on the Touch.
I'm playing Simon the Sorcerer 2 right now.
The emulator is free. You just need to do som "searching" for the games.
http://www.scummvm.org/