For Christmas my wife picked up a copy of the Ponds and Water Gardens 2010-2011 Annual guide. It is packed full of tips, how tos, and is a fairly good resource on plants, fish, and pond equipment. I found a few products I had not seen before but also found them to be very expensive.
This guide is worth picking up if you are considering a pond but have never owned one, or if you are new to ponding. $7.99 at PetSmart.