If you're stuck for information on any walking region in the world, this is a pretty good place to start. Walkingworld founders David and Chris Stewart went with Explore to Peru and the Inca Trail in 1998 and can recommend them wholeheartedly. This year it's an Explore trip to Nepal - we'll report back on it if we survive. Cross Country International Company offering guided walks in England, Ireland, Scotland, France, Spain and Italy. Or take it easy and just climb the highest peak in Antarctica.
Site includes a chat forum where travellers can compare notes.