My favorite of the bunch was the playful soap/shampoo dispenser which kids can use by themselves. My son is terrified of having his hair washed so maybe letting him do it himself would quell his fears (plus he loves penguins). I've put a few other favorites below and you can check out these and more bath releases at Skip Hop.
(Images 1 & 2: Carrie McBride. All other images courtesy of Skip Hop)