P-Camp - Product Camp 2011 - is an annual barcamp for people who are product managers and in related fields. I have been at the last few, and it is a day well spent.
Barcamp's (barcamp.org) are free or near-free, open source meetings - the agenda is usually set at the start of the day.
Product Camp this year will be April 2. It's free. but you must register to get a space.
Sponsored and organized by SVPMA - which is a great service for the Silicon Valley tech community.