I was standing right in front of two 65 inch panels side by side last night; A Panasonic PZ800 and Sharp's Flagship R series showing the finals of Olympic judo in Bic Camera near Ginza. Katabi ng Sharp yung 50V flagship ng Sony. In all honesty, I cannot decide which looked better for that particular TV broadcast. The colors of the Pany are just as appealing as the brightness and clarity of the Sharp and Sony straight on. A regular viewer would not watch his/her TV on the edges right?
LCDs sell more than Plasma not only due to better marketing, more makers, more sizes but also because its PQ actually looks absolutely fantastic if you feed it with the right signal. My LCD showed as clearly and as beautifully as my Plasma that Michael Phelps did not win today.
But I appreciate that right signals are not necessarily available in any location. So what you should do is to bring whatever equipment you have to the store (PS3, Xbox360, BD, HD-DVD, DVD, DVD Recorder, Videocam, Recorded TV show, VHS, Betamax, your HTPC, your Popcorn, your cellphone, etc.) and asked to be allowed to test all of these to see with you own eyes what to expect when your bring the equipment home. If you are a serious buyer, I dont think the seller would refuse such kind of tests (and inconvenience) at the store, but just be considerate of the time or day, and bring your own test equipment and data. Take note of the illumination of the store and compare that with your own TV room. This is an important factor as Plasma shines better in the dark while LCD excels when it's bright.
Many first time buyers are confused and endlessly second guessing themselves because of the amount of this investment, whatever the salesmen are saying, whatever Pana and Samsung or Sony or Sharp are publishing, and the claims of the members of this board. The thing is, most everybody is biased. Who cares what the experts think if you and family prefer another? If "you are a serious buyer NOW, I would try to spend more time doing tests and observations in stores than reading about specs and reviews and claims and posts. That way, you'd better appreciate that both technologies have weaknesses that you simply have to accept.
So whether Plasma pa rin or LCD pa rin, decide it with your own eyes while considering your particular needs and applications. Seriously, I like both. LCD and Plasma complete each other.
BTW, neither one will be obsolete until you get the itch to buy a new one.