A look inside Multiverse: Mars Colonization Authority
YouTube has several demo reels of projects going on inside the Multiverse platform. This one is from http://www.marsauthority.com/
in which the game will be to develop a colony on Mars. It sounds like a great premise for a virtual world simulation. The video is shot entirely within the platform.
Media and blog for SDForum's Virtual World SIG
http://www.sdforum.org/vwsig