Automating regression testing

System

One of the things that has been a concern of mine for a long time is how to go about automating regression testing of workflows, templates, and such. I've just never gotten around to doing anything about it. It seems like with 6.x, more stuff is directly exposed as action urls, so in theory, it should be a lot easier to build a generic framework for automated tests. Has anyone out there put any thought into this?