I found this report on the net. Some of you may have read it but I thought it interesting enough to scan through and link here.
It's a 40 page report on the state of Virtual Worlds focusing primarily on the Evequest Economy.
It's PDF format (Adobe Acrobat) and about 400kb in size.
http://papers.ssrn.com/sol3/delivery.cf ... tid=294828
It was published in Dec 2001 but most information is still valid.