It is an annual event currently in it's 21st year. Every year it is in a different part of the state and is typically themed around the history of the particular area. This was our first multi day event and my wife and I are hooked. We will be back next year. The Sherpa camping is definitely the best way to go. You get all the advantages of camping with none of the hassles. The organization is top class.
Here is their general web site
http://www.bikevirginia.org/
and here is the 2008 site
http://www.bikevirginia.org/2008/index.htm