Switchgrass if great IF you can convert it to ethanol, or use it straight as a biomass fuel. Ethanol from corn is incredibly simple. Starch to simple sugars... ferment... distill. The reason you only get the 350gal/acre is that you only use the grain as opposed to the whole plant with switchgrass. An added benefit is the extraction of corn oil, which becomes biodiesel.
We're one of the groups trying to develop an economical conversion method to go from a field of switchgrass/biomass and get ethanol from it. Not an easy task. One method of using the switchgrass that I personally like is to pellatize it. Use it in a standard wood/corn pellet stove for fuel. To run an engine, gasify it, and run a generator.
Oh, well... we'll get there someday.
Michael