I've looked at and driven the Sport Trac. I like it.
I dont think it is a good option for someone who needs a lot of payload capacity a lot of the time or for someone who is going to tow more than 5000 lbs. However, for someone who only need occaisonal pickup capability it is a neat idea. Around here, I would guess that 90% of people who drive around in pickups have nothing in their beds 95% of the time, and I would probably fall into that catetory if (when) I have a truck.
I like the Sport Trac's flip over bed extender, composite bed, multiple interior and exterior bed tie-towns, the power outlet in the bed, the power rear window, the hard, lockable bed cover, the ability to have a sunroof, the roof rack that can take Yakima or Thule canoe/kayak/bike attachments, and the comfortable seating. It came in first in Consumer Reports review 2 months ago of four-door short bed trucks.
The Chevy Avalanche is a clever technological idea, but to me is ugly and way over-priced.