Perhaps the guys that run this site
http://www.gps-speedsurfing.comWill let us post catamaran results.
They seem to have a pretty good set up. Its a nice way to get a global competition going.
I have seen more and more of this type of event going up on the net. i.e. where a competition is run in such a way that you don't have to turn up on a particular day.
This Kayak company
http://boatertalk.com/forum/SurfZone/764382runs a freestyle event, where you just video your entry and you could win a new kayak.
Gareth