Recently I stumbled across a website that can be quite a boon for various webdesign works. Check Browser Compatibility, Cross Platform Browser Test - Browsershots
Often enough, various browsers and OSes tend to render websites in various ways. It's often almost impossible to test all options. One just doesn't have access to all browsers, all OSes.
And here comes this website into play.
It allows you to specify a URL to test, the Operating systems and browsers to use and then creates snapshots of the website.
It's not as good as seeing the page yourself, but the screenshot is still good enough to give you a basic idea if there's a massive bad kink somewhere.