Jonathan Kadlec, one of the folks running the Northern Virginia SQL Server Users Group, has kindly added information to the NoVaSQL web site on many of the user groups that are active in the Mid-Atlantic region. If you're interested in finding a group, or if you want to have your group listed, check out:

http://www.novasql.com/usergroups.htm

Also, if you're considering going for the MCDBA certification, you may want to check out:

http://www.novasql.com/MCDBA.htm

Thanks to Jeremy for providing these useful resources.