I linked this above, but it's so directly relevant to your idea that I thought I should re-link it here: check out the Julie/Julia project, which was one woman doing approximately the same thing with cooking, albeit on a more focused topic:

http://web.archive.org/web/20021217011704/http://blogs.salon...

(As a side note, I love this idea, and would cheerfully jump into doing it myself were I not already rather overcommitted... From having cooked various world food banquets, I can tell you that you'll learn a HELL of a lot very quickly from doing this. Great idea: blog it!)