It's also not as simple as Plasma's Vs. LCD/LED's. The spec's vary from brand, model, series, etc. You can pick up plasma's with crappy black levels and poor motion handling if you are not careful. Also, be careful with just picking the best looking ones in the stores. Some TV's get hooked up with fancy loop programming with slow motion and bright color scenes and look amazing in the store. Once you check them out for a hockey game it might be a different story.
Check out
www.televisioninfo.com for some great technical reviews of all the latest models. Also, AVS forum is pretty good for user reviews but there are a few fanboys there that answer questions about LG's with "get a panasonic". So things can get derailed.
There was a great post on here about them a while back, so try searching this forum for some input as well.