I am playing with Opera 7.11 and I am in love. I gave up on Opera back at version 4 because even though I loved the interface, it had issues I couldn't ignore. This latest version solved all the old problems.
I don't know how I ever lived without mouse gestures! They make surfing so much easier that it's not funny. It's sort of like when the scrolling wheel first came out. Once I got used to it, I hated mice without a scroll wheel.
I even made the jump to making Opera my default browser and replaced the IE icon on my XP start menu with Opera. Life is good.
One thing I noticed is that there is a debug stylesheet that is really helpful for showing screwed up tables when I am working on my board or other sites.
I miss Roboform though

Opera's built in form-filler isn't quite as good. Roboform was wonderful for creating new accounts at sites because I was able to configure it with my default password of choice.
Amy