Here is a WiFi enabled Arduino robot that can be controlled wirelessly or serve as an autonomous robot. It is equipped with an Arduino Mega 2560 R3, so you can customize it for your projects. Its onboard video server is useful for remote presence projects.
This robot has a 4WD IG32 Direct Drive robot chassis with 6 inch wheels, Sabertooth dual 25A motor controller, a pan & tilt infrared camera system, a LV-MaxSonar-EZ1 range finder and everything you need to get started.