The guys at the kitehouse have been playing around with standup boards in light winds with kites. More at:
http://fksa.org/showthread.php?t=5124
I've been playing with standup a little bit but favor going kiting or free diving depending on conditions at this point. Need to do it more often I think. Would love to work on wave riding more in some of the ground swells we get on occasion. The balance grows on your through time all though if it gets too rough I still find it fairly easy to get tossed off.