I've written many times about cross browser importance and you all know how clients can be difficult when it comes to project review and the final result isn't what they asked for (usually because most of them still use IE6) so you just have to test your code and design in all major browsers, operating systems, screen resolutions etc.
Multiple IE program can help you here for IE testing and here's the list of couple services you should bookmark that make testing your latest web design a breeze.
Browser Shots
I think this one is currently the best, it's free and it generates screenshots of your web design on a wide number of Windows, Mac, and Linux browsers. Enter your address and press submit and after 10-45 minutes (depending on current loads) you'll get screenshots of your site as displayed on a variety of different Windows/Mac/Linux browsers. The interface can be confusing at first, but it is a great free service. It's available on other languages too and the one of the best things here is that you can enable Java, Flash and JavaScript. http://browsershots.org/
Browser Camp
This one i really like and use a lot since i am not Mac user. It's not free, prices are starting fro $3 for two days, but you can do Apple Safari testing for free. It also supports large number of browsers including Javascript, DHTML, Ajax, Flash etc.. http://www.browsrcamp.com/
Site Vista
Site Vista is product of Litmus, it's a commercial web page testing service starting at $9 a day. Besides wide range of platforms for design testing you can also test Over 90% of email clients to ensure your email displays correctly for all your readers. It has clean, friendly, and fas user interface and also offerers some interesting services like one-click publishing, with just one click you can show your client a copy of the compatibility results. Precise bug tracking lets you see exactly where the compatibility issues are at any time, painless version management keep your results super-organized with our unique versioning system. http://litmusapp.com/
Browser Cam
It costs more then the rest starting at $39.95/month but provides testing on the largest variety of different OS and browser combinations. It offerers free 24 hour trial with 200 captures. And two features really stand out the first is a special VNC remote access service that allows you to test interactive design elements such as pop-down menus, rollovers, or flash animations. The second is inclusion of several mobile browsers such as BlackBerry, and Windows Mobile. http://www.browsercam.com
Cross Browser Testing
This one is a new service, but it offers a lot of bang for your buck. First, it offers private VNC access to a multitude of operating systems and browser configurations that allows you to fully test for html, ajax, css, javascript, flash and other dynamic feature compatibilities on a website. Second, they allow you to run any configuration for 5 minutes for free. Not just once, but as many times as you like. They also have screenshot capabilities and there is no limit to how many you can take. Finally, they differentiate their service by utilizing a pay-as-you-go model. If you need to run sessions longer than 5 minutes, there is a paid service which removes this limitation and gives you priority access over users of the free service. There are no recurring monthly fees and no long term commitment. You just pay for what you need. http://www.crossbrowsertesting.com/
And you could try this
on December 6, 2009
BrowserSeal is a new fast multi browser screenshot application that supports Firefox, IE6, IE7, IE8, Chrome, Safari and Opera and allows to test web sites located on a hard drive or corporate intranet. Prices are extremely competitive.