Depends on the application, in larger family room settings the plasma wins hands down, the heat isnt a factor because of the large room Also it offers better viewing angles, ie the person in the corner of the room can actually see the picture.
also smaller tvs ( sub 40" are better as a lcd screen maily because of cost )
Plasmas no longer have burn in, they look great and have darker blacks than LCD's. LCD's have less "ghosting" if you game but if you dont game ( and when I say game I mean PC game, i notice no ghosting on our 60" Panasonic Plasma playing ps3 and 360 )
In smaller rooms like bed rooms LCD's win hands down, run cooler, use less electricity and from the dead straight on viewing angle the look as good as any plasma.
I too used to be a Plasma hater until i researched it and found that the original problems with them are now gone.