There is already an imgur.el on github, but it’s doesn’t seem ideal (it does much more than just uploading; it seems to be using an older API; it relies on external programs; and most seriously: it wasn’t written by me), so I wrote a new one.
(For convenience, I’ve included the imgur.el in the meme repository, too.)
Kudos to the imgur people for creating such an easy API for uploading images. It literally took 15 minutes to write imgur.el. Literally!