See screenshots of your web site with different browsers

I've been looking for a site like this for quite a while. BrowserShots.org lets you select from 67 different browsers/versions, and allows you to select parameters like screen size, color depth, and what features are enabled in the browser.

It takes a little while for the results to come back (at least five minutes or so, though you can begin browsing the first few screenshots almost immediately), but this is a really helpful service that I could have used years ago.