If you're organizing a DebConf12, and especially if you're new to it, please have a look at the DebConf BoF HOWTO.
One of its main take away messages is: don't be exclusive, think of the kittens.
Since last year, and to the might powers of DSA (and their
kittens), we now have a more stable place for the gobby
server: gobby.debian.org
. I've just amended
the howto to point to that, and updated the info about which gobby
package to use (nowadays clarified, thanks to
Phil).
Enjoy your BoF-s!