I just confirmed registration for Google IO 2011 in San Francisco on May 10-11. If anyone's interested in meeting up after the day's sessions, we can organize here.
I'll also buy and sell Bitcoins and MTGUSD for cash (USD) at the conference. I won't charge any fee above those I incur on Mt Gox for the trades. If anyone's attending from outside the US, this could be a cheap way to get USD for spending while you're in the country. Either way, let me know before hand how much USD you want to buy/sell so that I'm sure to have enough to meet demand.