Rambling on about Django 62 months ago.
I've answered the question about changing the visual width of fields several times in #django IRC. I may as well write it down somewhere so I don't have to repeat myself. :)
Step 1: Create a template file (replacing the [blocks] with appropriate info) named admin/[appname]/[objectname]/change_form.html. Fill it with something like:
{% extends "admin/change_form.html" %}
{% block extrastyle %}
<style type="text/css">
#id_[fieldname] { width: 20em; }
</style>
{% endblock %}
Step 2: Dance with joy
Leave a comment or see my other ramblings.