E.W.
You could always do a book themed party where people bring a book for the baby and write something special in it. It is like starting a library for the baby =)
I have an invitations business and have done a couple of invitations for that theme, if you would like to see them I would be happy to show you (they are not on my website yet). If I finally ever get pregnant with #2 I am definitely going to do the book theme, we read everynight to my daughter before bed and I think it would have been special if they ha a sweet message from a family member of friend.