Using the magnets from a dead 3.5" HDD and a piece of wire, I made a super strong refrigerator magnet. When I say super strong, I mean this thing will hold up anything I ever wanted to put on my fridge.
Step 1: Find an old Hard drive, and take it apart
For this job you'll need some torx drivers of various sizes (5.5, 8, and 10 were what I needed). Just keep taking out screws and peeling back labels until it's all in pieces.
Step 2: Make a little wire handle
I used some 18 gauge solid core wire I salvaged from a vacuum cleaner motor... you can use what you have on hand.
Step 3: Stick stuff to the fridge!
Speaker magnets work well too, but I got tired of trying to clean the metal shavings from the rivets off the magnet. Does anyone know a better way to take speaker magnets out?