Jannis Leidel - An autocomplete widget for django-tagging form fields
Jannis Leidel has put together this useful blog post which shows how to use jQuery to provide autosuggest on your django-tagging fields in Django, in both the automatic Admin screens and in your own custom forms.
The only real downside I can see is that it sends the entire tag list with the initial request, so if you have hundreds or thousands of tags then it wouldn't be overly bandwidth-friendly. In those situations it should be relatively easy to modify this to use an XMLHttpRequest, though.
Nice work, Jannis!
http://jannisleidel.com/2008/11/autocomplete-widget-for-django-tagging-form-fields/