We have them - my DH works away from home a few nights a week and we chat on Skype and can see each other at the same time. Mine just clips to the top of my screen and shows my head and shoulders plus a bit of space around me. I think his is intergral to his laptop. I can pan it around for example, sometimes I show him something on my design wall which is behind me - it's in my sewing room. :-D
Funny story - my Mum and Dad got one when they moved over here, to chat to friends and family on Skype. First time up, Mum was chatting to her sister and she (the sister!) suddenly screamed. My Dad had come out of the shower, no towel, robe or nothing and wandered into shot! :lol: