I've tried pair programming a few times at several companies, and while it's occasionally been great to work through a specific problem, in general I wasn't a fan, it was awkward and boring. But recently, at my startup, I've been sitting on the couch coding on the TV (because I switched over to iPhone development and the only spare mac was the TV mac mini, and it can't drive my 30 inch monitor.) Pair programming has actually been happening fluidly with this set up, and it's been great. It's comfortable to sit side by side and both have a head-on view of the large monitor.