Well it wouldn't be useful to me in that configuration, I was thinking more of things like dorm rooms and so-on. Having a centrepiece imac that does everything could be pretty useful and be a big space saver. Most people wouldn't bother with a second screen as most* people aren't as fussed about the gloss.That statement is just silly. Why would you want two screens if you're only going to use one? The Mac mini is much better for that job; It is smaller, nearly as powerful, much cheaper, and better looking.
*probably.
I agree the mini is more useful in that role as most people have a much bigger TV already.