We have one that we need to get a box for. But it's just a small 13" SD TV we got so my wife could watch the news getting ready for work. After remodeling the bathroom we lost the spot for it so it's been sitting unused anyway. Of course if I would just run a cable line to it I wouldn't have to worry about it anyway. From the way I understand it, having cable takes away the need for the box. My others TVs that we use are a 32" Sanyo HD tube TV (Heavy sucker) and a 52" HD LCD Sharp. We have older 27" SD TVs hooked up to cable in the spare bedrooms. So we should be OK. Definitely OK with the TVs we actually use.
On the HD forum I am on, the big thing with a lot of people is they think that everything is changing to HD, when it's actually just going to Digital.