Here is another triangular robot with wheels that let it move in all directions. This Programmable Triangular Omni Wheel Vectoring Robot was built by SuperDroid Robots. It weighs 6.5 lbs and can support 10lbs of weight. It has IG32 24V 265RPM gear motors, Arduino Mega controller, 2200 mAh LiPo battery, and everything you need to get started. Example code is also available.
More information is available here.