I recently spoke as a guest at the Silicon Valley SQL Server User's group. About twenty-five people showed up, from DBAs to developers. I spoke on how to use the SQL Server 2005 Performance Dashboard. This is a very active user's group, and if you should live around the area, you should check it out. Their website is at:
http://www.baadd.org/SQLServer/SiliconValleySQLServerUserGroup/tabid/68/Default.aspx
If you live closer to San Franciso than to Silicon Valley, there is also a San Francisco SQL Server user's group. Check it out here:
http://www.baadd.org/SQLServer/SanFranciscoSQLServerUserGroup/tabid/67/Default.aspx