Channel 9 have just posted a video featuring Sarah Blow, Richard Costall, Dave McMahon, Brian Long and Guy Smith-Ferrier talking about the UK Community while at TechEd. Good discussion on the community as a whole, some really good ideas coming out regarding channel 9 improvements.
I like the idea as a central google/live maps website which links all UGs together to advertise the meetings, Upcoming.org does a bit with regarding to more open source ug like ruby on rails but more could be done.
I attend NxtGenUG meetings whenever I am around and they are a great evening. Microsoft have a list of usergroups on their site – http://www.microsoft.com/uk/msdn/community/usergroups.mspx . Have a look and see if you can find one which interests you, it is worth it!