So, a silly post for today: Postcodeine. This is a British version of Ben Fry’s zipdecode, a “tool” for visualising the distribution of zipcodes in the United States. This is, as has been pointed out to me, wholly pointless, but it’s quite fun and writing it was an interesting exercise (it also taught me a little bit about AJAX, the web’s technology trend du jour). If you want the source code, it’s at the foot here; licence is the Affero GPL, as for all the other mySociety code.
(I should say, by the way, that I wrote this in my copious spare time. It’s copyright mySociety because I don’t have the right to use the postcode database myself.)