Here's another article from the Internet Explorer developer's blog. This one is about the Quick Tab feature:
Hi, this is Uche again, I am back to talk about Quick Tabs, a visual way of managing tabs in Internet Explorer that complements the tabbed browsing experience quite nicely. This feature came about when we realized there were two main issues users were likely to encounter when browsing using tabs. First, as you open more tabs there is less space to show titles, making it difficult to identify a specific tab. Second, because many web pages have very similar titles picking the correct tab by title alone may be very difficult. We developed Quick Tabs as a way to visually manage your tabs. Quick Tabs provides a thumbnail view of each tab that allows you to view, find and manage all opened web pages easily and effectively.