I thought I'd seen a thread along these lines before, a long time ago - but couldn't seem to find it quickly. The member base has changed quite a bit recently anyway!
For those that aren't aware, it's a bit like a high tech treasure hunt. You download GPS co-ordinates from geocaching.com for a particular "Geocache" (there's loads around, chances are there's loads near where you are) and then go out and find it, often with a more precise clue when you get to the rough location. I became ever so slightly addicted since getting into it a couple of years ago, but haven't been so much recently and looking to start finding some more in the new year!
So does anyone around here do it, or is anyone interested in it? My username is the same bog standard one I use everywhere