Slightly different validation to that of jpwatts; developed with knowledge of that snippet but written up from scratch for use as a fallback for when the Javascript Assist is off. I'm no master programmer, so feedback/comments/criticism is more than welcome. The accompanying Javascript (xfn-admin.js) can be found here: [http://www.djangosnippets.org/snippets/1266/](http://www.djangosnippets.org/snippets/1266/).
This code assumes your XFN field is called 'rel' in models. See the last call (addLoadEvent down the bottom) for the two lines requiring modification; otherwise, aside from the Django-styling involved, it can be used anywhere. The accompanying model.py and admin.py information can be found here: [http://www.djangosnippets.org/snippets/1265/](http://www.djangosnippets.org/snippets/1265/). I'm no master programmer, so feedback/comments/criticism is more than welcome. EDIT: Fixed my esoteric dev. comments and removed references to spawning more overlords.