BrowserSeal

BrowserSeal is a fast and easy to use cross browser testing and screenshot tool. It allows you to capture an image of your web site under multiple browsers with a single click of a mouse and instantly inspect the differences.

It supports Internet Explorer (IE6, IE7 and IE8), Firefox (3.0 and 3.5), Google Chrome, Opera (8, 9 and 10) and Safari (3 and 4).