Have an issue where you need to compare web ui in multiple versions of IE? Not a problem with Tredosoft’s MultipleIE. First, install IE7 to use the most current version as your primary and then download TredoSoft’s MultipleIE and run shelled versions of IE 3.0-6.0. on the same machine.
The solution isn’t necessarily 100%, but it does provide a quick, simply, and free approach to multi-browser testing.
Of course, you may also want to install some additional browers for testing purposes; I’ve added a pretty common lineup for reference:
You can download the latest version of TredoSoft’s MultipleIE here:
http://tredosoft.com/Multiple_IE
Note: Unfortunately, Multiple IE will not work in Windows Vista, a known issue.
Browser Cam
There is also a service (probably several) which provides you a much richer collection of browser/OS permutations for testing called Browser Cam.
This service does cost money (day, month, year subscriptions), but allows you to terminal into OS-specific client machines and test different browsers easily.
Note: I’ve experienced a bit of a delay when using Browser Cam, and occasionally boxes do temporarily go down (or at least appear unavailable) from time to time, so make sure you allocate a bit of testing time aside for using services such as Browser Cam.
Nicholas Barger's Blog 