There's a ton of useful information available online about XMRV. Here are just two videos you should check out:

Professor of Molecular Biology/Microbiology on XMRV in CFS - http://www.youtube.com/watch?v=wnuJSLnoZjk

I especially like Annette Whittemore's Speech on XMRV -http://www.youtube.com/watch?v=ReIffHuaEHA