Well like it or not we all need to test in other browsers. IE and Firefox aren't the only browsers in the world. Webkit browsers are increasing in numbers and we need to pay attention to them as well. In the past I've used Konqueror to test but I'm not a big fan of it myself, so I did a quick Synaptic search and found a few other options. Midori is a nice little browser which uses webkit.
A couple other options which came up were webkit rendering for Epiphany, Arora web browser, and Kazehakase which allows Gecko and Webkit rendering engines. So there are a few nice options for testing without having to buy a Mac or install Chrome for Windows.
Also I hope everyone has a Merry Christmas!