I have only tried the beta version of the new Opera 9, but I will download and install the official version later today. I am not sure how much better this latest version of Opera is though, they have added some new features, widgets and BitTorrents (and more), but I am not sure if I will use any of the new features. But since Opera is from Norway and I simply love the browser, I just got to get the latest version.
At the moment I am reading OperaWatch and the coverage from the live event in Seattle, it seems to be some really interesting things happening there today.
Oh, I almost forgot. You can download Opera 9 here.
update: I just found an interesting comparison between how many uses Firefox vs Opera