Sitting up in bed in my TV room. I've got back problems which make it difficult to sit for long periods of time. Though in my office I have a chair similar to the one GreenGambler posted.
I'm sitting in some old fabric office chair here at work. It allows for easy rocking so I kind of like it. Sadly, they got us all new ones a couple of years ago, they are now everyones "guest chair". No one sits in them regularly because they like sit straight up and just feel cheap.