I know the feeling. After doing a big metric century in Chico I thought I'd be anxious to ride again, but even after I got in my cycling clothes last Saturday, I sat down to pay bills and cleaned house....Arrggh... altho at the time it seemed like the right thing to do....
RX: Watch a bit of a Lance victory via DVD, grab a friend and do a short ride. It's sensory memory and all good things, even motivation for a ride, will come back to you.