I just finished my first game of go on a 19x19 board. I played against a 15kyu player, and lost by about 100 points (I should have lost be about 80, but blundered stupidly near the end). I literally feel ready to throw up. I'm very kinaesthetic and apparently my body confuses playing a position I don't understand at all with being dizzy. Hopefully this will stop happening in the future.
19x19 go is huge. Probably equivalent to about 30x30 hex.
Kiseido is a nice go server. A lot of interesting stuff has been done with CGoban, and java web start is actually working okay now. Web start's proclivity to make applications look like they're subordinate to it as an architecture would make me not even consider using it though - that's so obnoxious as to be offensive.