What do people use for notetaking, if anything?

As I'm learning, I'll go out and take say a 100 or so shots and when I get back to the computer sometimes I forget what I was trying to achive with a shot.

Do you folks use pen/paper, audio recorder,memory etc. while out and about?

I've used the 'take a shot of your hand at the start and end of a sequence' trick. Any more tips n'tricks?

Thanks