a very useful place if you are planning to spend big money:
www.avforums.com
If you have a room the size of a tennis court then hell yes, looks great.
If you live in a normal house with room sized rooms then I just don't get these huuuuuuuuge tele's. I've always thought it's better to spend the money on big sound if you want to add drama to stuff on the box.
In our normal house (1905 semi) we installed a wall mounted 50" plasma last year when the old crt went pop and its not too big for us even in a 12'x11' room (mounted on the 12' wall so we are sat at most 10' from it), but we don't receive tv, we only use it for dvd movies.
Our 1366x720 is fine at this distance, full 1080 screens are probably a bit better with 1080 hires content and displaying photos but you would have to sit a lot closer even on a 50" screen for 1080 to make a big difference, and with normal resolution DVDs this 720 was giving a better image than the 1080 screens we tried.
You've got to go and try looking at them, somewhere where they are setup reasonably well, preferably with inputs you'd expect to be using (eg dvd via hdmi or component). Most of the shops had really poor quality low res piped satellite tv, appallingly bad signal and you had to get them to give you the remote so you could get the colour settings off "vivid" and onto something proper.
We went out to get a highly rated 1080p 40" screen but when the dvds were tried on it there were strange line effects (they were inserting extra lines to make up the 1080 and it didnt work well enough)
High quality component video leads made a big difference, there was somebody recommended on the avforums, he makes them to order.
"DVD essentials" was a useful purchase (its a setup dvd) for setting up brightness contrast and colour etc
plasma is good for dvds but get LCD not plasma if you are planning to play games or use with a pc, the plasmas can get burnt if a high brightness area is on the screen in the same place for too long
if you are going to use the pc input check the screen's manual to see what resolutions it will support, it's not always the screen's full res.
hope that helps