That's a Jerusalem Cricket. It's really a common insect, but it normally lives under the soil, so it is seldom seen, thus earning the title of "Most often requested for ID".

Here is a link that might be useful: Jerusalem Crickets on BugGuide.net

Cindy C, thank you. I'm glad to hear what it is and I've let him free in the garden. I hope he eats some squash bugs. I thought it was a fascinating creature but I have to say that it gave me quite a start when I found it on the kitchen floor.