I just like downloaded Opera 11 and its totally way better than Opera 10. For one thing I'm like loading the pages on this site and it all loads in one, before it will load the page first and then apply the right font and stuff so it always made this little jump that was totally annoying. Anyway Opera 11 is the tops.
I am a bit of a web developer, and I decided to download the main browsers in order that I may test that all my designs and functions work properly in each browser. When I started using Opera I was really amazed by how fast it was and how clean and crisp the design was. (I'm using the Mac version by the way) I recently upgraded to Opera 11 and it still amazes me. Quite honestly, I'm not really sure why I haven't set it to be my default browser yet.