Sorry mr rubber duck, you're old news...
2. Waterproof books - R's baby loves a book so she got him one to play with in the bath (she thinks he'll be the next John Grisham...). Buy them here.
4. Watermill - interactive and fun. Gowi toys make a great one. Buy it here.
6. Foam letters - Munchkin's set of 36 colourful letters and numbers which stick on the side of the bath. Buy here.