has an excellent Instructable about the magnets in an iPad 3.
I haven't seen anything yet about the mini. I just spent a half hour figuring it out. So I thought I would share it here. I see there's a video on the YouTube that reveals the location of the important magnetic switches, but YouTube is an evil scourge to humanity and should never be supported.
Anyway, until someone does something better, here's the info on how I did it at least.