I'm not really sure what all the buzz is about with tabbed browsing. You either have a bunch of tabs, or you have a bunch of tasks in the taskbar. What's the difference? With a little tweaking I've been able to surf with 20+ windows open in IE. AND a download or five.
I guess I am not willing to throw myself into learning the ins and outs of FF or Opera. I have them installed, but don't use them often. Can't use them for any site that I need to log in to. Extensions are just more bells and whistles that I haven't found a need for.