This recent journal article grabbed my attention. It's from Nature.com and is titled "Will your next poster session be in Second Life?" by Huang, Kamel Boulos and Dellavalle in EMBO reports, Vol 9, No. 6. 2008. PDF here.
It looks at expanding technologies of the internet and how they are getting increasingly sophisticated. The trend towards user-oriented content, or web 2.0 has rapidly expanded our ability to communicate and share information with one another over distance and 'supposedly' made us more efficient in the process. The article outlines a number of examples of web 2.0 platforms and includes virtual worlds as one way of providing education.