This is why you should use Internet Explorer 9
It's hard to describe just what makes Internet Explorer 9 such joy to use. It would be easy to say 'it just works,' but that would be a cop-out. IE9 is like a simple, beautifully elegant dress -- sleek lines, no frills, but masterfully designed with a singular purpose in mind: Web browsing.
The first thing that strikes you with IE9 -- except the fact that it requires a frickin' reboot to install -- is just how smooth your interaction with the browser, and thus the Web, is. The UI has been designed by a genius, and the way tabs and windows whoosh around is reminiscent of Firefox's Panorama. There's definitely been a move towards more tactile interfaces in recent years, and it leaves Chrome feeling positively clunky in comparison.
Moving on (I've calmed down now), the unified tab-and-address bar area, which has received a lot of flak for being too small for power-users, is resizable! You can simply make the address bar narrower, leaving more space for tabs. More space is also dedicated to tabs on wider displays: screen widths over 1280 pixels (i.e., every power-user) have two thirds of that space reserved for tabs -- it's only on smaller screens that the address bar occupies half the width (and it's still resizable!).
Putting the One Box (Omnibox, eat your heart out) on the same line as the tabs also puts IE9 into first place as far as vertical space is concerned. It's about 20 pixels more compact than Chrome, but almost half the size of Firefox 4's bulky address-and-tabs-and-huge-orange-button setup.
The pinned app icon also has a jumplist that can be added with a few META tags in a site's HTML. Right click your Twitter icon and you can jump straight to 'New Tweet.' A site can also notify you of changes to a page through the Superbar -- if you pin Facebook to your superbar, you'll see a red star appear when there's activity on your news stream.
IE9 blurs the difference between the Web and your operating system -- and that's intentional. The average user now spends so much time surfing the Web that the underlying operating system, and downloaded, locally-run apps, have become all but redundant. Remember, too, that Google is working on a browser that is an operating system.
[Internet Explorer 9 download link]