Like the title says.
The two that I got recently are both free and both cool.
City Caller ID: This brings up the city in which the phone was registered under. Basically an automatic area code finder, handy for business owners or random WTF calls from people you don’t know.
Asand: Great time waster. You pour sand around and then play with it. It’s fun because it interacts like real sand would, move your phone around and watch it flow!
Any others??