Architect Groups
International Association of Software Architects (IASA), http://www.iasahome.org/
Western Pennsylvania Enterprise Architecture Forum, http://www.wpeaf.org

User Groups
BaltoMSDN http://www.baltomsdn.com/
Baltimore SQL Server User Group http://www.itresourcepartners.com/bssug/
Capital Area Microsoft Integration and Connected Systems User Group (MICSUG) http://groups.msn.com/MICSUG
Capital Area .net User Group http://www.caparea.net/
Central Maryland Association of .net Professionals http://www.cmap-online.org/
Chinese IT Professionals at Greater Washington http://tech.groups.yahoo.com/group/CITGW/
Hampton Roads SQL Server Users Group http://www.hrssug.org/
Maryland and Pennsylvania Microsoft Developer User Group http://www.mapamdug.com/
Northern Virginia SQL Server Users Group http://www.novasql.com/
Potomac Area FoxPro User Group http://www.pafox.org/
Richmond .net User Group http://www.richmonddotnet.org/
Richmond SQL Server User Group http://www.richmondsql.org/
Roanoke Valley .net User Group http://www.rvnug.org/
Roanoke Valley SQL Server User Group http://www.rvssug.org/
Rockville .NET User Group (RockNUG) http://www.rocknug.org/
Sharepoint Users Group of Northern Virginia http://www.sugdc.org/
Central Penn .NET, http://centralpenn.web121.discountasp.net/home/
Delaware Valley SharePoint, http://www.dvsug.org/Pages/Default.aspx
International .NET Association, http://www.ineta.org
Lehigh Valley .NET, http://www.lehighvalleydotnet.org/newsite/default.aspx
Philadelphia Computer Society, http://www.pacsnet.org/
Philadelphia SQL Server, http://www.pssug.org/
Philly SharePoint, http://www.phillysharepoint.org/Pages/Default.aspx

Code Camp Events
Mid-Atlantic Code Camps, http://www.madcodecamp.com/
Silverlight Dev Camp DC, http://www.barcamp.org/SilverlightDevCampDC
Philly .NET and Code Camp, http://www.phillydotnet.org