I have personally used Knoppix 3.4 for the past 3 months, and it has been the most stable, reliable, and fastest operating system I have ever came across. I used to use Windows XP and 2000 concurrently, and I recently ditched them in favor of Knoppix. Knoppix comes with a wide range of software titles, and can even boot off of it's own CD without ever having to format your hard drive? I could go on and on about Knoppix, but the best thing is just to try it out for yourself? Visit http://www.knoppix.org to experience the next level of computing!