Here's a part for sending those shortener requests. It's also in parts bin (PartsBin/Wiki/URLShortener). (Note: In some current versions of chromium/chrome, 302er responses aren't handled correctly - for this reason, that parts overwrites short cuts in those browsers without confirmation.)
Related to my introduction of permissions to our CouchDB installation, now it is no longer possible to update/delete short urls someone else has created. :-)
You can only update your short urls (or delete them).