Yellow post-its cluttering up your fridge and mirrors are so yesterday. The hip new way to post a reminder to yourself and the rest of your family is the Hi! Magnetic Voice Recorder. It’s a soft rubbery device with a magnetic back that you can stick anywhere. Press a button and record a 10-sec message. It comes in red and blue, and is cheap enough to be considered disposable, although the batteries do last a long, long time.