Checkup
Checkup for the iPhone and iPod Touch gives a quick overview of your device and runs some basic diagnostics testing the CPU, memory, GPS and accelerometer.
The CPU, memory and storage are checked using a variety of speed tests.
The accelerometer test shows constantly updated x,y,z velocites and the device's orientation.
The GPS test will display your current latitude, longitude, altitude, speed and course heading. This is a convenient way to see your location for logging purposes or to determine accuracy against a dedicated GPS unit.
Tests for the network are forthcoming.