As each guest arrives and signs the guestbook they also fill out an envelope addressed to themselves. At the end of the shower the guest of honor receives the addressed envelopes and a set of thank you cards to put in them. Brides and moms are busy ladies, and saving them the trouble of digging out their address book one more time is a life-saver.
So, the next time you are planning a shower (or any type of party, really), think one step ahead and prepare to have some thank you notes at the event. This will give the guest of honor more time to write the personal thank you notes, and a little less stress.