I do use one, but it's via my Mac Mini connected to the TV.
Most solutions are kind of kludgy like that (i.e. Google TV, which won't be available in Europe until September). TV manufacturers just started releasing QWERTY keyboard remotes. So it's possible a new TV will have one, but AFAIK, they aren't too widespread yet.
AppleTVs can link with iDevices, and then you can use the iDevice as a keyboard. I believe Samsung makes TVs which can connect in a similar manner.