Thank you notes!
Give everyone who is attending an envelope from a set of thank you notes that you will later present to the Mommy. The guest address the envelope with their address. Use these envelopes to draw for "prizes" as the shower goes on. Everyone who is drawn for a prize must also offer words of wisdom for the new Mommy. At the end of the shower you may give the thank you notes w/the addressed envelopes to the Mommy. She doesn't have to look up addresses for thank yous; It's done for her.