GoPro really waterproof?

It certainly is:

http://www.youtube.com/watch?v=SHz3Dha267s

The slightly different catamaran video ...

That looks cold. Give some credit to the self-tacker for not breaking while being used as a pull-up bar

just before the flip you see the crew go hey look it's a big puff coming.

I seem to be an expert at pitching downwind just like that... I was watching this yelling at the crew to move back!

The Gopro is pretty tough, you do have to inspect the casing everytime you mount it though, the base has snapped of by quite a few people.
A friend of mine also found it doesn't float

ya a floating version would be good...don't ask me how I know.

hehe.. my Oregon ATC2K observing the bottom of the Lake Como since 2007...

to make it float, attach it to a piece of swim noodle.

There is no place for a lanyard on the go-pro(current model). it would be nice but i am sure they sell more without them. My first go pro made it exactly out 2x before i lost it (operator error).

Mine made it about 7 minutes...

Thats about $29 per minute and now actual viewing of any video...