The washing machine is leaking from underneath it. There is no leaks in the water hoses or the in the drain hose. The back is dry, but the bottom is wet.

You will need to pull off rear cover and top so you can see down inside to see what is leaking. Unplug first, then use a water hose to fill it up. The leak should be easy to see then. Here is a manual: http://dl.dropbox.com/u/8010163/Whirlpool%20Catalyst%20Washer%20Service%20Manual.p df

Spot on, Thank you!

You are welcome.