Region: Jaguarland USA Education Second Life is a popular virtual space for meeting friends, doing business, and sharing knowledge. Aether Education & Travel (okay, I'll plug my little project).
(Aether has guided tour notecards from some of the past tours I've done for the university and for Oxbridge--steampunk and Caledon on the lower floor with educational and non-profits on the 2nd floor)
Learning in a virtual world? See examples of education and nonprofits in Second Life, the leader solution for virtual meetings, events, training and simulations.