Seeed Studio started selling Makeblock, a new Arduino controlled modular robotics platform. They are made of aluminum, and come in many modular shapes you can design your robot with:
Makeblock is made of strong, hardened aluminum which is able to support the weight of an adult and more. In conjunction with a more durable material, Jasen and Alex, have developed a unique design utilizing threaded slots to allow you to put screws anywhere along the beam, eliminating the need for nuts and providing unlimited options in placement. They also use industrial standard components, motors, links, timing belts, gear and rotational and linear bearings to bring flexibility to this system. Let’s not forget that the kits are 100% compatible with all Arduinos/Seeeduinos and the whole Grove Prototyping System as well!