I created my first account in Second Life in early 2007; I didn't really spend a lot of time inworld until 2009, though, and I didn't start thinking seriously about the potential of VWs in education until 2010 / 2011, so I'm a little late to the party. Although I'm primarily interested in seeing how educators are using virtual environments (both inside and outside of Second Life), I would also just like to see more of the cool stuff out there, whether it's related to education or not.
I've done some limited exploration of other virtual worlds in the last couple of years (on my own, on the occasional excursion with Pathfinder's Hypergrid Adventurers Club and more recently through UW's Virtual Worlds Certificate Program), including JokaydiaGrid, ReactionGrid, OSGrid, Blue Mars, Inworldz, Jibe, web.alive, and WoW.
Aevalle, I think that your practice of visiting a different virtual environment every week is a great idea; I'd like to start doing something similar, time permitting (either on my own or in a group setting). I think that it's essential to keep building on our knowledge of and experience with the different platforms out there, and to keep up with what others are doing with the technology. I also totally agree with your thoughts on group tours as a shared experience and as a way to build community. :)