I just stumbled across a useful tip for you Linux users. If you want to test your websites on IE5, IE5.5, IE6 - it's actually pretty easy to install them under wine. In fact, there's a really tidy script you can find at IEs4Linux. The instructions are simple - just download it, unpack it, execute it, and answer a couple of questions, and you've got the three versions of IE mentioned above, all ready to run from Linux.
Too cool.
