iPod Apps for stoners?

So I just recently got an iPod Touch (I'm on it now) and I am trying to make a good collection of apps to play with after a good bowl. So far I have found one excellent, yet simple game, called Spawn, to provide hours of endless entertainment. It's more or less a visializer on steroids + interactivity. If anyone else has any further suggestions, please share and build upon my budding collection.