DC Media Makers is a no-dues group of people who meet monthly to share tips and tricks for creating video for the web. The group is open to novices as well as more advanced video producers.
National Captial Area Macintosh Users Group is a no-dues group that meets once a month at the Cleveland Park Library.
Virginia Macintosh Users Group meets in Arlington once a month.
DCTV, the local public access television station, right near the Brookland subway stop, teaches video editing classes.
Gandhi Brigade is a no-cost youth media organization that meets Saturday mornings in Silver Spring, Maryland.
For general purpose learning about videoblogging, there's no better web site than Freevlog.