Just found that Adobe just launched a preview of Adobe Browser Lab a tool for cross-browser testing of web pages and apps as it would appear on different browsers and operating systems,and it let’s you define browser sets for testing and set 1-up view 2-up view or onion-skin view, check Adobe Labs for more info or visit Adobe BrowserLab
BrowserLab provides web designers exact renderings of their web pages in multiple browsers and operating systems, on demand. BrowserLab is a powerful solution for cross-browser compatibility testing, featuring multiple viewing and comparison tools, as well as customizable preferences. Since BrowserLab is an online service, it can be accessed from virtually any computer connected to the web. Also, Adobe Dreamweaver® CS4 software users have access to additional functionality such as testing local and active content.
- Firefox 2.X and 3.X (Windows XP and Mac OS X)
- Internet Explorer 6.X and 7.X (Windows XP)
- Safari 3.X (Mac OS X)
Viewing and Diagnostics Tools
Screenshots can be viewed in a single view, side by side view, or as an overlay view with variable transparency. Each viewing option features a zoom function.
Browser Sets
Browser Sets allow designers to customize, edit, and save a combination of browsers to test.
The Adobe BrowserLab Preview at Adobe Labs by David Gamez, unless otherwise expressly stated, is licensed under a Creative Commons Attribution-Noncommercial 2.5 Mexico License.
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Please check http://www.browserseal.com/ – although it supports less browsers, it can easily beat BrowserLab in terms of speed.
Thanks will check it out !!!