[Update: Mark Fleischmann has a commentary on 1080p]

Your HDTV may boast a resolution of 1280 by 720, or 1024 by 768, or 1280 by 768, or whatever. But it is highly unlikely that your HDTV boasts a resolution of 1920 by 1080 interlaced. It is even less likely that you have a full 1920 by 1080 progressive display. The number of HDTV models that fall into that category are few. 1080p isn’t being broadcast by any networks, nor is 1080p supported by a single DVI cable, though HDMI does support it.

But that is starting to change. Companies like Sharp are introducing 1080p LCD sets to the market and pretty soon 1080p is coming from DLP manufacturers. Soon 1080p HDTVs will be common, and we can only hope that there will be 1080p content to see on these displays (as opposed to upconverted 1080i content).

Link: PCWorld