Small fantasy map generator

I ran across an interesting web page on fantasy map generation.  It's actually pretty neat, is open source, and can generate small map on the web page itself.  If you're looking for a Tolkien-esque map of a small portion of randomly-generated world, this could be useful.

Example of a map generated on the linked web page

Note that it only creates a coastline, rivers, city locations, borders, and crude hills/mountains.  There are no forests, swamps, etc.  Maps are limited to the small square image shown above.  But it could still be useful - and for programmers, the techniques could be useful in other contexts beyond the simple web page they're shown on.