With tabs you can:
Use one Internet Explorer window to view all your webpages.
Open links in a background tab while viewing the page you’re on.
Save and open multiple webpages at once by using favorites and home page tabs.

To get started:
Press the CTRL key while clicking links (or use the middle mouse button).
Click any tab with the middle mouse button to close it.
Press ALT+ENTER from the address bar or search box to open the result in a new tab.

I love this one! I’m using it on my blog actually (click my name)