Virtual Worlds Tour from Sharon Burns
Information Superhighway to Nowhere
MacArthur Foundation CIO Sharon Burns (whom I met briefly last month in Chicago) has posted the first part of an excellent tour through various virtual worlds on Youtube, for those who are looking for a quick and smart overview. I learned more about it in 8 minutes than I have in most longer presentations about virtual worlds, so there is certainly some benefit to brevity.
There's also a useful writeup of the video on Susan Tenby's blog at Netsquared, if you want an even briefer writeup and some additional information.


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