I am not particularly fond of software that tries to be smart and guess what my intentions are. This usually results in weird suggestions that break the flow of things. So after contributing to the Firefox 3 download World Record attempt, I was quite annoyed with the location bar that is supposed to be "awesome": not simply auto-completing what I type but suggesting unwanted alternatives!
Of course I immediately went to the preferences in order to turn off that feature. I know they are trying to compete with Microsoft, but did they really have to bury this preference that deep? At least it is accessible. But when you turn it off, it turns off auto-complete altogether. D'oh!
So I turned it back on, and try to live with it. It is supposed to be self learning, maybe in time it will understand that I want it to just suggest a straight forward auto-complete....