We are lucky enough to have an "entertainment" room which has our HD stuff (projector, PS3, pre and power amp, 5.1 system, record player (!) DVD/CD player) and a front room where my parents usually watch a lot of the cookery / asian channels from normal Sky box (where the CRT is).
I was thinking of upgrading the CRT to a flat panel but from looking at the performance of various flat panels recommended by What Hifi in shops I don't think any of them (for SD broadcasts) match the CRT.
I suppose the CRT makes the best of the poorly encoded SD broadcasts from the Sky box.