If you haven't joined yet, I definitely suggest you give it a try. If you want to find out more, you can go to the the SLDNUG site at http://www.sldnug.net/
I personally try to attend every one of these and the UG lead Tori is really great! We had some great swag available: I gave away FIVE vouchers for free MS Exams and Tori gave away a ton of books and software. They are also planning to have regular speakers and other great UG activities.
Additionally, I am happy to announce that the Visual Studio Island in-world will be given to me in Sept and I intend to turn it into a great community area for everyone to enjoy. Lots of great stuff happening, come join us!
http://www.secondlife.com (it's free to join and free to attend and free to be free) :)