Opera for Free
Opera is now available for free, ads and registration have been removed.
Just gave it a quick try, and I have to say, I like it 
I think, Firefox is going to have to co-exist with Opera on my HDD.
Update: According to Heise.de (German), Opera has been downloaded over 1 million times within only two days, more than any previous (ad-enabled) version.
I am Software Engineer and partly self-employed. I develop mainly for Windows on the Microsoft .NET platform, but also C++, Java, and sometimes Python and PHP for web applications. I also consider myself a Linux enthusiast. (