I just purchassed a fairly cheep 4.o MP Hp camera that is advertised to be weather resistant to keep on my boat. It is not fancy but it had all the features I was looking for for a fishing camera (small, timer, recharagable batteries that can also use standard batteries, and weather resistant)

http://hpshopping.speedera.net/www.shopping.hp.com/shopping/images/products/l1891a_400.jpg