Darn...I was thinking I might have to send in the registration card
FYI, PRS states that you should register within one month of the purchase date:
THIS WARRANTY IS EXTENDED TO THE ORIGINAL RETAIL PURCHASER ONLY AND MAY NOT BE TRANSFERRED OR ASSIGNED TO SUBSEQUENT OWNERS. IN ORDER TO VALIDATE YOUR WARRANTY, AND AS A CONDITION PRECEDENT TO WARRANTY COVERAGE HEREUNDER, YOU MUST RETURN YOUR WARRANTY REGISTRATION WITHIN THIRTY (30) DAYS FOLLOWING THE ORIGINAL DATE OF PURCHASE. YOUR PROOF OF PURCHASE OR SALES RECEIPT MUST ACCOMPANY ALL REQUESTS FOR WARRANTY COVERAGE.
http://www.prsguitars.com/csc/warranty.html
FWIW, I think it would be nice if you could register the guitar online at the PRS site.