In 3D Benchmark you can test the 3D power of your iPhone, iPod Touch or iPad.
This application is available on the App Store:
3D Benchmark for iPhone, iPod touch, and iPad on the iTunes App Store

It is a free app.

When you get your result, you can put it in this thread to compare with results of other users.

39.9 fps on iPod Touch 3G 32GB 3.1.3
18.6 fps on iPhone EDGE 3.1.2
18.2 fps on iPod Touch 1G 8GB 3.1.3
15.5 fps on iPhone EDGE 2.2.1

[ame=]YouTube - iPhone Benchmark 3D[/ame]