DLP (Digital Light Processing) TV

Advantages

DLP screens are larger and are cheaper in the short-term than LCD or Plasma.
Good brightness and color. DLP can illuminate a larger screen for more people at a cheaper initial cost than Plasma.

Disadvantages

There's a high maintanence cost. The DLP TV is basically a video projector in a box. You have to replace the lightbulb, which has limited durability.
DLPs take up a lot more space than Plasma and LCD and are not wall mountable.
DLPs don't have as good field vision as Plasmas, meaning you can't get as good picture quality when viewing the screen at an angle.
DLPs are not known for having that great of picture quality.
Fast moving objects can cause a trail of colors (color artifacts).