ChuckN

This guy's a dumb-ass. At least use Ballmer so that there's some reality to the satire.

python-webkit2png mentioned above does and it runs on xvfb which is extremely handy.

Python-Webkit2png is the best solution - believe me I've been through them all, it's based off of Roland's script mentioned below and is on PyPI:

http://pypi.python.org/pypi/webkit2png

http://github.com/AdamN/python-webkit2png

-Adam