I had used both plasma and LCD TVs. From my own experience:
- LCD is more expensive than Plasma, at least for those at the same resolution.
- LCD can operate at a higher native resolution than Plasma.
- LCD can be brighter and more vivid than Plasma.
- LCD is a little bit thinner than Plasma.
But on the bright side, you get what you pay for.
I exchanged a Panasonic Plasma HDTV for a Sony LCD HDTV. Never... ever... regretted my purchase ever since.
Oh yeah, and they were both 1080p, and they can both output 1920 x 1080 from PC. The Sony LCD can do 1920 x 1200, though.