There are a number of utilities around aimed at helping the Geocaching community. Here's one that I came across recently that automatically produces a prodfile signature. If you click on the image below, you will be able to create one of your own.
Stephen Gale's blog. I have no excuses - these are subjects that interest me - goodness knows if anyone else is interested in the same ones! They cover technology, Photography, Strategy and Design related topics. Plus some other loosely associated material!