Django admin expects users' passwords to be entered as SHA-1 hashes in the format {{{[algo]$[salt]$[hexdigest]}}}. Here is a tool which automates calculating the hashes on the client side.

You need to
 * use the Firefox browser
 * install the [http://greasemonkey.mozdev.org/ Greasemonkey] extension
 * install the djangopasswordhasher.user.js user script

Pros:
 * works on all standard Django admin sites
 * nothing to install on the server side

Cons:
 * needs the extension on the browser