Just saw this on MSNBC. Cool. The chair can get through sand and go right into the water and float. They interview a woman with MS as well as her husband, among others. I'm not sure it would work well in high surf, though!
http://www.msnbc.msn.com/id/21134540...13433#39913433
http://www.msnbc.msn.com/id/21134540...13433#39913433