In my new Gardeners Supply catalog they have 3 natural approaches to ridding ones yard of moles.
One is a diluted solution of castor oil sprayed all over the yard to repel the moles. It looks like Chanley was right about the castor beans!!
The other two solutions are some type of beneficial nematodes that feed on the grubs that the moles like to eat. The concept is- get rid of the moles' food source- the moles go next door, or elsewhere.
They all sounded pretty good to me. I'm going to try milky spore because it sounds like a much longer term remedy. Their website is www.gardeners.com
They have a lot of other natural pest control products too.