There is a lot of info about various kinds of medical magnetic therapies-
http://www.google.com/search?q=Magne...ient=firefox-a
http://www.google.com/search?q=MAGNE...ient=firefox-a

I did use therapeutic magnetic bracelets and necklace for my wrist & neck pain - but since the pain was caused by repetitive motion- as long as I continued to do the same job they only helped to relieve some pain at the time.
But it may have helped my RSI to not get as bad as some have experienced.
I definitely did have less pain while wearing them.

But there are special therapeutic types of magnets I don't know about using hard drive or speaker types..