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As we all know, not all browsers are created equal. Some refuse to play nice, or follow the standards of the internet, and instead mangle our websites beyond all recognition.

In order to test out what our site looks like in each of the different browsers, we need to either keep a room full of PCs, Macs, Linux boxes etc, with all the different browsers on them for testing purposes - or we can use the variety of online browser testing websites.

Browsershots is probably the most fully featured one, but there is usually a bit of a wait for screenshots to be processed, and sometimes (unless you hit the Extend button a few times), some of your screenshot requests will expire:
http://browsershots.org/

Another handy one for testing the IE range (up to IE7 at time of writing this), is the netrenderer:
http://ipinfo.info/netrenderer/index.php

Enjoy, and may your websites be free from browser anguish!