IE8 RC1: The Address Bar
In general, IE8 introduces a more Firefox-like address bar, and RC1 continues the top-line improvements. The RC1 address bar now prioritizes which site results show up first. Sites from your history will pop up first as you type, followed by entries from your favourites. RSS result feeds are no longer included by default.
The new IE8 has some tweaks to its history and favourites handling as well. None of the changes struck me as being significantly better than anything competitors have been offering for some time, though.