I agree with Kevin, the "queue" is useful to open links while surfing, to later file in del.icio.us.

It is almost a methodology that changes the very way you look at the web. Somehow, things open like pages in a notebook instead of looking at seperate packets. It is also easier to correlate things and find common threads in your browsing, no more lag time that sometimes allows precious thoughts to escape your mind (lag from glancing down and identifying which window has what topic and then dragging your mouse down to click then look up and review what you were looking for).

It allows quick access but adds to the amount of information overload we receive. Indispensable during del.icio sessions and google news. Life w/ tabs is better than life w/o tabs. Most are use to reading top to bottom/left to right and tabs allow the eyes to settle easily on what is available instead of down at the bottom of the screen. And, you don't move the mouse as much (standard ways of multi-tasking IE windows are drastic mouse movements and alt-tabs) which I find much more efficient.