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In this paper we introduce the Caltech Multi-Vehicle Wireless Testbed (MVWT), a platform for testing decentralized control methodologies for multiple vehicle coordination and formation stabilization. The testbed consists of eight mobile vehicles, an overhead vision system providing GPS-like position information and wireless Ethernet for communications. Each vehicle rests on omni-direction casters and is powered by two high-performance ducted fans. Thus, a unique feature of our testbed is that the vehicles have second order dynamics, requiring real-time feedback algorithms to stabilize the system while performing cooperative tasks. The testbed will be used by various research groups at Caltech and elsewhere as a means to validate theoretical advances in multiple-vehicle coordination and control, networked control systems, real time networking and high confidence distributed computation.