I started using Selenium a couple of weeks ago and have found it pretty useful for testing things that get a little long-winded with Rails Test::Unit.

We've been using it for about a year. It's fabulous.

We've not yet got around to plugging it into Cruise Control, so it still gets kicked off manually every morning on our test server. But we will, one day. honest.

The only real problem that we've had involves the Selenium IDE (which I recommend you take a look at). Some of the scripts it generates are not compatable with IE 'cos its XPath support is broken.

But Selenium had identified *loads* of bugs for us. We love it.