What browsers do you test your sites in?

Recently I've had to create a website for my mums primary school and I decided to use it as a University assignment as well. For this I tested the website in several different browsers, IE6, Firefox and Netscape 8. Although generally when testing a website i'll own bother with IE6 anD Firefox.

What about everyone else? Do you test your sites in every browser out there or only the big 3, is it important to you that your site works well in other browsers or is IE sufficient enough?