INETA Europe with 205 User Groups (and ca. 56.000 Members) in April 2006... User Groups per Country: Germany 44, Russia 28, United Kingdom 24, Poland 13, Austria 12, Spain 9, France 8, Ireland 8 etc. Largest User Group is UGIdotnet (Milano, Italy) with 12274 Members.
[1] http://www.ineta.org
[2] http://www.ugidotnet.it