Fox Valley Computing Professionals

There have been plenty of fee-based browser preview sites, but I recently came across a free one that works better than most any other I've tested.

Browser Shots allows you to select from a long list of browsers/versions on up to four OS's, including BSD, Linux, Apple's OSX, and Windows. The user inputs the URL they would like checked, and Browsershots plugs it into multiple virtual machines running actual instances of those browsers, and then outputs actual screenshots.

This is incredibly invaluable to anyone who has wrestled with getting a CSS layout to render correctly (and by correctly, I don't necessarily mean identically) across multiple platforms and browsers.

http://browsershots.org/