What's the difference between LCD Flat-Panel and...

In all the ways that really matter, there isn't that much of a difference between the two. Both types of Flat-Panel TVs are thin enough to be placed virtually anywhere, and produce a picture that is startlingly clear, sharp, and bright. The only difference that really matters is the screen size. The majority of LCD TVs have a screen that measures 30" and smaller. TVs with a screen of 32" and larger are typically the domain of the Plasmas.
Technically, LCD and Plasma TVs are entirely different approaches to the same result, because they create images using completely different technologies.