I just put a world map showing the location of all known caches on my web site. You can find it at http://www.brillig.com/geocaching/maps.shtml. If you still see a map of the United States (which used to be at that URL) try hitting the 'reload' button on your browser. The US map has been moved to ./united_states.shtml.
As always, if you find any bugs, typos, or other problems (or if you just have an idea for something to add) please let me know.