I'm looking for clay blocks, and they are quite hard to find. I know that I could simply edit my inventory and add more clay blocks, but that doesn't quite have the same "fun" factor as setting out in a boat and fighting tooth and nail to wrest every last clay block from the hands of those filthy creepers.
Are there any external utilities that will at least point me towards the nearest patch of clay? I saw this image in the minecraft chat that looks like it could be what I want, but I don't know how that screenshot was taken (or how to use it).
Edit: Thanks to the mod, I discovered a cache of 88 clay blocks not 20 units from my spawn!