I've been going to the local ones (DemoCamp, StartupCamp, FacebookCamp) for the last little while and they're definitely worth it. You learn a few interesting things, see a cool demo or two, meet some people etc.

Depending on when the next democamptoronto is and how much work I put into my project, I was hoping to demo it and launch it then. Realistically, it'd probably have to be the other afterwards though.