Waaaaaay to late on this, but still a week early! My wife really wants us to go, but after taking in the county fair a week and a half ago, and with her herniated disc, I don't think it's going to happen. And, I'm ok with that.
http://www.policylibrary.tax.virginia.gov/OTP/policy.nsf/0/fc3161c06d9a67db852569cb005b1354?OpenDocument Says its a 3-year statute of limitations except for various exceptions listed (failure to file, filing a false return, etc.).