Well, while we have a IE8 address bar gripe thread dredged up, I have a complaint about the address list entry deletion feature.
The delete button is not visible until you mouse over it. The button's location is right where I naturally move the cursor after clicking the down arrow to show the list. And since my eyes are on the left side of the list to read the urls, this has resulted in me accidentally deleting an entry I knew was there instead of navigating to it on several occasions.
I'd suggest moving the delete button to the left side in a future version to avoid this.