I just tried out the Opera web browser and it only took about 30 seconds to determine that it was definitely not for me. It uses some sort of weird, Windows-MDI-style interface where you can only have one Opera window open and little browser windows open inside of the Opera window for each web page. You have some limited ability to scoot the little browser windows around inside of the Opera window but you can’t move them out onto the desktop and put them anywhere you want, so it’s essentially useless for people (like me) who generally have lots of open browsers. If you only look at one web page at a time, it might not be a bad alternative to IE and Netscape but it looks like Mozilla still has the most potential.
Trying out Opera