When you need to remember something, writing it down is really the best way to go about it. That being said, not having a piece of paper to write it on is a hindrance. Before you have to scribble a phone number or appointment time on your hand again, get a WEMO, the wearable memo pad.
This is a slap bracelet that is also a notepad. There are four different, fairly neutral colors, each with a different style of lines for different work situations. The bracelets are erasable, even when using oil based pens but the longer the note stays there, the less it will come off when you try to remove it.
Good for people who have to take down measurements as part of their work or hobbies. Measuring something? You can list it right on wrist. Need to remember some directions or a room number? Jot it down! You can get your own for $25.