About 350 people at the start; about 450 by the time we returned to the starting point after walking through Oakland. Compared to other PGH area rallies, this was the best behaved (stopping for traffic lights) youngest and most upbeat, despite the downer of CA's prop 8 passing. And the only one that got so much bigger with people joining in as we went by.
More great signs:
Sue at Pittsburgh Lesbian Correspondents has more.