GXmark is a free benchmarking utility to evaluate and compare gaming performances of different devices.
And it's a nice demo too ;)
GXmark release history
v1.1f - new icon, now correctly displayed on ppc2002 devices
v1.1e - flipscreen calculation bug fixed
v1.1d - now supports @migo and h5450
v1.1c - now display version in the result screen
v1.1b - bug fix in the tunnel and rotozoom timing measure on some devices
v1.1 - new...