Some people seem to be hitting on the head, others are in some kind of strange denial.
I don't get why you would "hate" this technology? It's virtually a freebie and it has many uses.
Yeah obviously most of us would never use 6 monitors. But like a few have said there are people who need more than 3 monitors. I've sold a few machines for stock junkies and they all wanted 4 monitors. This meant 2 video cards and even then you had less control over how the worked. For those rare few who would have in the past had to run either more video cards or expensive Matrox boxes to split a higher resolution across many monitors know that it's not just cheaper, but it give you more control over your screens! The Matrox boxes never knew where one screen ends and another begins. Nothing would ever split in any smart way and you had almost no control over it.
Now forget that. The fact you can run 2 or 3 monitors and you have more control over how the programs and games span across them is a GOOD thing! Many of us run two monitors. I do, and I can't imagine running 1 larger monitor over 2 smaller ones. Damn you would have to get 1 large ass monitor to equal that work space and you still probably wont get the same overall resolution. I like having more resolution and I like having a split in between them. The monitor in front is my main web surfer while the one to the right is running Foobar, system monitors, and uTorrent! I only need to glance over there once in awhile but it's nice to be able to do it. It cost almost nothing to find a spare monitor and do you think I could afford a GIANT monitor that has 2,304 pixels across? That's what a basic 19" and a practically free 17" monitor gives me. DAMN! Two "small" 19" monitors would give me 2,560 pixels across! I would need a $2,000+ monitor to do that! Yet I could probably pick up a matching 19" monitor for under $100!
My point is many of us love running 2 monitors over one large one. It might not be as good for watching one big movie, but it's better for running many apps at once. You get more real estate for a fraction of the cost!
Now what if you want 2 monitors and a big TV off to the side? I could see this being somewhat common. Perhaps the TV is a little ways away but you run an HDMI cable over to your home theater setup. So you could still use the PC with 2 monitors while someone watches a movie on the TV right?
You can do that off your bog standard 5770 or 5850? Well I say that is awesome! These cards come with this extra ability and yet don't really cost any more than the "other" cards with the same horsepower in other areas. So it's virtually a freebie like I said!