to switch the autocomplete off in the address bar:
1. Go the the advanced page of the internet options dialog
2. In the Settings tree view, there's the item Use inline autocomplete ..., which by default is on. Spacebar toggles it on and off.
IE9 seems to remember other things I've typed even though I have auto
complete stuff turned off, or do I/ How do I keep it from second guessing
It seems to be filling in stuff that's in my favorites.