Once it is mailed, I track the package to see when it arrives. The printer usually sends proofs back two weeks after they recieve my hard copy (the paper one in the package) and so I like to see when the hard copy gets there so I can know when to expect the proofs.
And the excitement builds!
The best part, of course, is recieving the box of completed books, but as that gets closer and closer, I get more and more excited.
I will probably start selling pre-realease sales coupons after I have sent the proofs back to the printer. Stay tuned!