Here's a great post about the new "trend" of charging kids to attend birthday parties.
http://thestir.cafemom.com/big_kid/156185/charging_kids_to_come_to
To everyone considering diaper showers, bring a card instead of a book showers, raffles of any kind, birthday pools (where the expectant Mom keeps half the money) etc etc.... Just don't. The same arguments described in the blog apply to baby showers too.