Truly a herculean effort has been undertaken! The Association of Virtual Worlds has compiled 'The Blue Book: A Consumer Guide to Virtual Worlds", an index to 250 virtual worlds from all over our physical world, all neatly meta-tagged and linked. Oh, and there's a glossary...
From their site (someone loves themselves some iphones!):
The Association of Virtual Worlds believes that virtual worlds represent a major information and technological revolution in how we work, play and live. The Association mission is to serve those companies and individuals who are dedicated to the advancement of this multi-billion dollar global industry and reach out to those who have not yet found virtual worlds.
1. To create a forum for the discussion of issues affecting the industry
2. To assist in the development of industry procedures and standards
3. To promote the virtual worlds industry, its interest and developments
4. To educate on the benefits of virtual worlds to enhance work and play
5. To offer business and social networking opportunities
6. To connect the public and consumers with members of the virtual worlds industry
7. To participate in the determination of the collective interests of the industry
8. To further the common interests of the industry
9. To provide leadership for the betterment of the industry
10. To recognize accomplishment within the virtual worlds industry
So the document is free.
Here's what I'd like, though... Put the whole thing online, wiki-fied, and let people add to it. Screenshots, stories, knowledge bases, forums, etc. That would be amazing.