The Blue Book: A Consumer Guide to Virtual Worlds Is Now Available Free from the Association of Virtual Worlds http://www.associationofvirtualworlds.com/publishing.htm"The Association of Virtual Worlds has just released its new title The Blue Book: A Consumer Guide to Virtual Worlds listing over 250 virtual worlds and is pleased to offer it free to anyone who is interested in the rapidly growing field of virtual worlds..... The Blue Book contains over 250 virtual worlds. Each world is listed alphabetically and includes a web address and brief description. In addition each world is classified as to whether it is live or in development, whether it is appropriate for kids, tweens, teens, or adults; and type of virtual environment it is, for example, a MMORPG (massively multiplayer online role playing game), a social network, a mobile application or a custom world."

2008 Metaverse Tour Video: The Social Virtual World’s A Stage

http://www.personalizemedia.com/2008-metaverse-tour-video-the-social-virtual-worlds-a-stage/
From Gary Hayes, Personalize Media blog:
"On my travels I got out my virtual camera and decided to capture a bunch of small vignettes which quickly turned into a body of audio visual delights - so decided to create a nice seven minute video for posterity." 50+ worlds in 7 minutes.