From: Jim in Parma
Q: How many more pixels are their between regular TV and High Definition TV?
A: Well, it depends on what type of HD capability your TV has. An ordinary analog TV (like the ones we are used to) has "only" 346,600 pixels on the screen. An 720 HD TV has 921,600 pixels. A full HD 1080 has 2,073,600.
For the best picture quality, a 1080 is the way to go.. though a 720 will do for most people who want HD without the huge price tag.