The HTML editor I want: live update in all browsers

As I've been doing a bunch of cross-browser CSS work, the one thing I would really love is a tool that would monitor the HTML and CSS files I'm working on, and when any one of them is saved to disk, refresh the page I'm working on in Firefox, IE6, IE7, and Safari. Of course this requires integration with a virtual machine on the Mac, but on Windows all of these browsers run natively.

Does anyone know of such a thing? Leave me a comment if you do. I'm getting sick of the manual refresh.