I'm not trying to be mean here, but...
1. We have a public bug-tracking system for bug reports:
http://code.djangoproject.com/timeline
2. Please search the bug-tracking system before reporting an issue;
odds are it's been reported before and someone is working on it or has
posted a patch.
3. A bug was opened for this, a patch was submitted, and a new
"maxlength" argument for URLField was added five months ago:
http://code.djangoproject.com/ticket/1477
(and yes, I'm aware that documentation of that change is lacking, but
when reporting a bug it's important to take advantage of the Trac
install to see if something's already been reported or fixed;
duplicate reports take valuable time away from improving Django...)
--
"Bureaucrat Conrad, you are technically correct -- the best kind of correct."