Comcast claims many HDTV channels are available for the normal subscription price in many areas. You need a hdtv and comcasts cable box. You pay extra for extra premium channels and some of the all hdtv channels but they offer the major networks (ABC, CBS, etc... and espn etc...) included in a regular cable subscription price.

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p.s. here is the blurb from comcasts site om hdtv from them

There was a time when you thought your old TV looked just fine. Then you saw HDTV. The clarity. The vivid color. The wide-screen format. And your only question was, how do I get it? If you have an "HD-capable" or an "HD-ready" TV set, a Comcast HD box is the only additional equipment you need (available for a small monthly fee). So there's no need to buy a separate HD receiver, decoder or antenna. And no long term contracts.

A broad selection of HD content. Unlike satellite, with Comcast you can watch local broadcast channels (like ABC, NBC, CBS, and PBS*) in HD without an antenna. So you can see the prime-time and sports programs that you wanted to watch when you bought an HDTV set. In addition to our HD programming, in many cities Comcast offers the enhanced viewing experience of FOX Widescreen.

Plus, you get great HD networks like ESPN HD which offers over 100 high definition games a year and selected ESPN original programming. Also, the INHD and INHD2 channels offer an exceptional variety of sports, movies, travel, and nature programming - all in high definition.

Finally, at no extra cost, premium subscribers can catch their favorite hit movies and many ground breaking original series from HBO HD and SHOWTIME HD. And for HD movie lovers, STARZ HD and CINEMAX HD are coming soon.