The
Chrono'Nauts parade also looks like it was great fun, and there are photos to prove it! It's staggering how many conventions have taken on steampunk aspects this year.
I confess that I do ignore a huge group of steampunk aficianados on a regular basis, not out of malice but just because I don't spend a lot of time (well, any time, really) in Second Life. However, the steampunk community there is absolutely vast.
The Heliograph keeps you updated on the goings-on there, and points the way toward other community websites.