5 links
AutoCAD Developers Group Europe
adge.org
A non-profit association of software developers who are working on applications around AutoCAD.
AutoCAD User Group for Silicon Valley and San Jose, CA
power.org
Information on group activities and many other aspects of using AutoCAD.
Autodesk User Group International AUGI
augi.com
The user organization officially sanctioned by Autodesk for its products. Further information requires registration.
Western Australian AutoCad Users Group
buildata.com.au
Contains meetings schedule and other organizational information.