So about a year ago, I created Visamapper(www.visamapper.com) for the same purpose.I ended up crowdsourcing the data. Slightly different take on the interface as your project. But I have to say, I'm just a little jealous because visamapper didn't get any attention on HN :-). Anyways, Nice job with the design. Small nitpick: The list of countries at the bottom is unreadable with the current font color.
