I realized while in college that I did my best thinking in the shower/bath tub. But I always forgot my good ideas in the process of drying off/getting dressed,

I realized while in college that I did my best thinking in the shower/bath tub. But I always forgot my good ideas in the process of drying off/getting dressed, before I could write them down. So I went out and bought an underwater slate (divers use them to communicate and record information underwater). It's probably 6"x9", made out of plastic, and has a pencil attached with a cord. I can jot down notes/sketches/doodles/whatever when I come up with an idea, and take the slate with me when I get out of the shower to record in a more permanent fashion. To erase, I just scrub it with a green scrubber sponge. I love it - it's paid for itself many times over. I also tried bathtub crayons. They're good in that you have more surface area to write on, but they wash off more easily and it's not as convenient to permanently record whatever you wrote down (it's hard to take the shower wall with you when you get out).