The biggest introduction to the toolbar is Google Instant. Here is Google’s video overview from their blog post
The bottom line here is that despite the once huge advantage that Microsoft had to make all of their IE users make Bing their search engine of choice, they are losing that battle as well as their browser market share continues to erode. Now, Google is making their toolbar act so much like Chrome that maybe people will want to give it a try. This does not bode well for Microsoft no matter how you try to spin it.
My question is what will happen to Bing’s progress in the search wars if IE continues to lose it’s once dominant position in the browser wars? Can you say trouble?