The "Get Involved" page [0] mentions that already : "You don’t have to be a C++ guru (or even know what that means!) to get involved. You just have to love the Web". I guess this page is specifically for programmers.
I've been looking for years for a good reference that says "human are bad at probability estimation", but this one doesn't seem to work: he's simply saying that we're very good at estimating regular risks (if I understand correctly).
In France, Paris, Lyon and Marseille have multiple postal codes, and some postal codes are used for multiple cities (postal codes were attributed to delivery offices in 1972, and new offices now use the number of the nearest numbered office).
(And no, Ziptastic doesn't work for French postal codes.)
[0] http://www.mozilla.org/en-US/contribute/