the way i understand it, there is really no advantage to running multiple ssd's in that way. most who run 2 drives do so because they cannot afford a large ssd, so they run a small ssd+ a platter-based storage drive. which still gets the benefits of ssd bootup times, with the low-cost-per-gb-storage that a platter-based drive offers.
other then vibration resistance, i don't believe that a dual, non-raid setup has any serious advantages..
though i do believe it is fully possible to do.