Ok, hwhrhett started a thread about a dartboard map based on a clockboard (http://www.crowsdarts.com/yda/pics3-20/ ... tboard.JPG), then ate it while I was responding. Here's my response anyway:
Hey dude,
People will probably hate your idea - there's a bit of resistance to maps that aren't instantly comprehensible, like the crossword map (which I reiterate is genius) - but that doesn't mean it's not an interesting one with some potential to be unique, and a strong appeal to a group with your tastes. The king-of-the-hill centre is kind of being put together with the Tenochtitlan map, so maybe something you'd want to consider (which doesn't exist on any other map here) is making the 25 point ring and the 50 point spot worth 2 extra armies to any continent held in conjunction with them - so if you hold the bullseye and x continent, it's x value + 2, but if you hold x continent and y continent, it's x + 2 + y + 2, so the bullseye becomes more and more valuable the more continents you have.
The 20 different continents you're suggesting could all be worth the same - they're identical - or you could assign them values in the haphazard fashion that a clockboard itself does, making continents 1, 2, 3, and 4 worth 1; 5, 6, 7, 8 worth 2, etc.