Here comes yet another best tool for web developers, from Adobe (who else?)
This tool is currently available as a free preview, so web professionals should try it while we can. You can login with your Adobe ID. Adobe BrowserLab provides web designers with an exact rendering of their pages in multiple browsers and operating systems. It is a solution for cross-browser compatibility testing and can be customized with preferences, as well as being an online service that can be accessed from virtually any computer connected to the web.
Link Adobe BrowserLab
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Please check http://www.browserseal.com/ – although it supports only browsers that run on Windows (Firefox, Safari, IE6, IE7 and IE8) , it can easily beat BrowserLab in terms of speed.