Microstructured fuel processing reactors have been designed and tested for the production of hydrogen from fossil and renewable fuels for fuel cell applications. For airborne power generation, a prototype reactor for the partial dehyrogenation of kerosene was developed, which produced more than 100 L/min hydrogen. A system is under development for the integrated reforming of methanol in a high-temperature proton exchange membrane (PEM) fuel cell, which will serve portable applications. To reduce the emissions of trucks during night time, a 5 kW auxiliary power unit (APU) was constructed for power generation during break intervals of the driver. A 250 W liquefied petroleum gas (LPG)-based fuel processor/fuel cell system has been developed fro recreational vehicles, which is now commercially available.