Have the idea of starting minor interest group / user group of various technology inside a company. Hope someday it happened and these information help 

http://egjug.org/hashimblog/2006/10/14/how-to-make-a-successful-java-user-group/

Fishbowl (conversation), setup a small group from large group for team discussion - http://en.wikipedia.org/wiki/Fishbowl_%28conversation%29 http://jchyip.blogspot.com/2007/11/fishbowl-standup.html