Brian Takita and Alex Chaffee gave a presentation at the SDForum Silicon Valley Ruby Conference over the weekend, entitled Full-stack web app testing with Selenium and Rails. We're going to do it again at Agile 2007 (and we'll have an extra half-hour next time, so we'll have time to do some interactive pairing with some unsuspecting audience member).
Here are the slides, courtesy of SlideShare:

