It's hard to read and write the news about Google's Toolbar 6 for Internet Explorer without thinking of how it must result from their official position siding with the EU against Microsoft's bundling of IE with Windows.
One of the major updates for the new IE toolbar is the Quick Search Box. This places the Google logo in the IE taskbar for a widget that enables a quick query with search suggestions. Obviously, Google isn't waiting around for regulations to help them maintain their search market
IE toolbar users will also get the personalized tab page that Firefox toolbar users got a few weeks back. The page loads the most visited pages of the browser user. (Google says they do this without gathering data. Instead, the data resides on the PC.)
Interestingly enough, yesterday's Safari browser update offers similar personalized funcationality.