Have you tried Second Life yet? Are you afraid to do so? This link with a auto vide on the home page may either entice you to try it or scare the heck out of you.
I am revising Second Life for my new role in ISTE. I ceated an avatar about a year ago (I am Maureen Mocha, they give you a list of sur name options and because of my coffee habit, well you get it...). Look me up if you try second life.
I have been lurking around on the ISTE island. You should check that out too. There is a lot of free virtual professional development going on there.
To participate in Second Life, you will need to download the viewer onto your computer. It is free. Go ahead and give it a try. I dare you :-).