The Internet Explorer 8 team blog has posted about the IE8 in windows 7.Here is what it reads-
The Windows 7 Beta includes a beta of Internet Explorer 8. I say “a beta” because IE8 in Windows 7 Beta is a pre-release candidate build of IE: it’s IE8 Beta 2 plus end user features that are only available on Windows 7 plus many fixes based on feedback we’ve gotten from IE8 Beta 2 usage. This post is an overview of what you’ll find new in Windows 7’s Internet Explorer, as well as some suggestions about how to get the best experience with this pre-release software.
Tabs are a very heavily used feature and Windows 7 makes it easy to switch to any tab you want. When you move the mouse over the Internet Explorer icon, you’ll see a thumbnail image of every tab of every IE window that you have open. Just click the page you want to get back to.

Continue reading at the IE blog here