I was just looking at the VA elections site and noticed there is a 31.5% (95k) less registered voters over last year state wide? Obviously as always, Fairfax County is the area to keep an eye on the early returns for any trends. In case not posted, here is the VA website to track the returns.
For those interested, here is the data (pdf-34 pages) for each county/city for total # registered voters. Good format.
http://www.sbe.virginia.gov/cms/documents/2009_Statistics/Sep/Statewide_Statistics_by_Locality.pdf
marked for later reading