I've put together the first stand-alone release of the zope.testbrowser package. It is used in Zope 3 for doing functional testing of web applications, but can also be used against any web site. It uses John J. Lee's mechanize as the back-end but provides a redesigned API that is more suited to testing, and perhaps other uses as well. For example usage look at the README. I'll release a 1.0 version when Zope 3.2 ships (should be some time in December).