John is right.. what you thought was tabs in ie6 is really LINKS, and as he said, you can turn them on. Furthermore, you can readjust your toolbars and menus anyway you like. Take a look at how I have mine set up: http://www.ve3oo.com/images/IE7-Links.jpg
One thing to be aware of is that the LINKS toolbar is really a folder in your favourites. So, if you save a favourite and you want it to be displayed in the LINKS bar, you save it to the LINKS folder in Favourites. That being said, it may or may not show on the LINKS bar, depending on how many urls are actually in the LINKS folder. The LINKS bar will only show as many as will fit. Sooo... see the double chevron at the end of the LINKS bar? Click it and you will get a drop down list of all the other urls in the LINKS folder. Just click and drag whatever links you want up to the LINKS bar.
Another tip: rename the names of the links in the LINKS bar to short names, so that you can fit more up there. Also, don't forget you can drag this LINKS bar anywhere, including on a line by itself. In my case, I don't like using too many tool bars (takes up too much valuable browser realestate), so I tagged it onto the end of the FILE VIEW.. toolbar.
At first I didn't like the new IE7 either, but it grows on you. Don't forget, you can right-click on any url link, and optionally choose to open that link in a new window or new tab. One thing I really like in IE7 is the ability to magnify the page.. see that 100% button in the lower right corner? click on it a few times. Great for those pages where the type is too tiny to read.
Also new in ie7 is the ability to scale down a wide page so that it prints completely when printed. That is a big fix!
Hope this helps.