Okay, this is a semi-serious link...
Just got a demo at work from one of the guys looking at Selenium which is an automated test tool for web apps... Oh and it's open source and free so the price is right! :P
Currently there is only a plugin for Firefox which can record your tests, but it's not bad, and it's open source, and the advantage I see is that you can record your test, and it generates scripts (which is just a simple HTML table consisting of 'action', 'control name' and 'value') so you can add/remove/tweak stuff from your test, and replay it for good old automated regression testing.
Oh, and you can play it back on other browsers like crappy IE etc.