Epsom salts are actually great for several uses. I give my son epsom salt baths. They can be very calming, especially for kids with ADD or autism. They also seem to help with moderate digestive issues. They also help draw toxins out of the body, including some heavy metals.
Here is a neat article that explains many uses for epsom salts:
http://www.care2.com/greenliving/use...ful-ways.html#
You can also use them in the garden, too!