personally i have both ie7 and opera. Opera is so much better. I recently downloaded it due to all of the problems that I have been having with ie7. IE7 is the worst browser out of the competive market.
We Window users are stuck with IE thanks to windows update. :grumpy:
I have all three, IE, Firefox and Opera. I like Opera the best. But very rarely Opera does not render a page correctly causing me to use Firefox.