Almost all current HD broadcasts are interlaced too ("1080i"), and will be for some time :-(.
AFAIU the reason they do this is that for most shows it's actually considered superior to the
equivalent progressive format ("720p"), because at a given bit-rate, interlaced video gives
better spatial resolution at the cost of some temporal resolution. Maybe. Something like
Looking forward to ubiquitous 1080p, myself. (At last, something to use those terabyte drives