I\'m looking at Selenium Server at the moment, and I don\'t seem to notice a driver that supports headless browser testing.
Unless I\'m mistaken, it doesn\'t support
I notice that you say that using an X framebuffer isn't a true headless solution, however, for most, I think it would be acceptable. In addition to that, this service will help get that going for you if you are interested in that as a solution.