Uploading and file storage for samklang
Samklang Media contains a storage for Django that will save files using a hash of the contents as part of their filename. It will also add a symlink to this from the original filename.
Ferdinand Beyer for his description of sha1-hashing in git: http://stackoverflow.com/questions/552659/assigning-git-sha1s-without-git
Arian Stolwijk, Djamil Legato for the file uploading mechanism using mootools.