Magnetic duct-tape

What's better than duct-tape? Magnetic duct-tape!
It couldn't be any easier or more versatile: Just stick a few centimetres of the 19mm (3⁄4") wide patented magnetic tape to the back of your photos, posters, calendars, etc. and a matching piece on the wall, the sloped ceiling, the fridge door, office cupboard, memo board, etc. The tape strips will stick to each other magnetically. And can be just as easily taken off again. Unlike conventional removable adhesive tape, you can use this tape again and again. Ideal, for example, if you need to reposition plans and maps several times.
Self-adhesive magnetic tape (via Red Ferret)