Ok, I've done a ton of googling on this but there doesn't seem to be a real consensus. Not that I expect a consensus here either but it doesn't hurt to ask ...
So. Once upon a time we warned to keep credit cards away from magnets. Then when smart phones, iPods, ereaders, and tablets came out, similar warnings.
Most of my purses are magnet-free, but I just bought a new one for travelling and it has a couple. And I just got a new case/keyboard for my tablet, and it has some teeny tiny magnets in it too.
Most of the info I've found online says that it would have to be a really powerful, rare-earth type magnet to do any damage to credit cards or anything electronic. But then you hear the odd anecdotal story about someone's fried cellphone or Kindle blamed on a magnet.
I do keep my credit cards in a RFID-proof case so I'm hoping that will keep them safe from the little magnets as well. But should I be worried about my cell phone & tablet?
Aaargh, I hate it when there's no definitive answer!