Looks like IE9 team at microsoft is getting active now in promoting IE9 across all the windows users who are still using older version of internet explorer, its been some time I started getting this notification to upgrade to IE9 again and again when ever I launched Internet Explorer, sorry but I don’t have a snapshot of that message pop up box.
But once you click to get the new IE9, you will be redirected to a new page which is actually the new landing features which talks about the key features of IE9 and reasons why you should use it, the snapshot of that page in shown in the image below.
As you can see in the image above, this page tells you how you can easily search or navigate in IE9, how you can view your favorites, how you can fix a broken page and still load it and how you can quickly hide or show toolbar in ie9. It also tells you about new smartscreen feature, suggested sites, compatibility view etc and how you can pin favorite sites in taskbar like facebook and twitter etc with ie9.
You can read more in detail about all new IE9 features here, read about how searching and surfing is much easy with one address bar here, learn about how ie9 is faster and more responsive here and read out other rest of new innovative features in ie9 here
Check out this new feature landing page of IE9 here