Testing your site on multiple browsers if important if you want to look professional. I found this out the very first time I showed our new site design to our Executive Director. My computer has IE7 on it, and the site looks great with it. Unfortunately as I found out that afternoon, the Director had IE6 on her PC, and the site did NOT look good. If you want to project a professional image for your organization, you have to make sure you site looks good in all the browsers commonly used by your visitors. Check your site stats to find out what browsers your visitors are using.
First, check out my previous post on testing your website on a Macintosh.
TheSiteWizard.com has a good writeup on How to Check Your Website with Multiple Browsers on a Single Machine.
I great tool that I've found is IETester for Windows. It allows you to open side by side tabs for IE 5.5, IE 6.0, IE 7.0 and IE 8.0. I'm not sure how it does it, but it's IE 6.0 showed my website messed up just like my Director's IE 6.
Microsoft has Virtual PC images for Windows XP with IE6 and IE7 and IE8 beta.
Tredosoft has the Multiple IE installer, which I have not tried.
