I've added a rudimentary Python-friendly ISP page to the python.org website:
There are very few providers listed so far, and for those that are listed, the information is pretty minimal, mostly taken from postings to c.l.py. Send feedback to email@example.com.
Virtually any web hosting service offers some level of Python support these days, even if it's nothing more than /usr/local/bin/python or the ability for shell customers to install their own copy of the interpreter. I am especially interested in knowing what sort of support beyond the bare minimum is provided. Many ISPs don't do a very good job publicizing such features (Zope availability, PIL or mxTools installation, etc), so it's helpful if the Python community can supplement the ISP's information.