Wanted to add my thoughts on the HP PDPs. I got the 5060 a couple of months ago (EPP is great) and it has been wonderful. I probably don't have some of the problems others are having as it's the display for my HT and doesn't need to worry about producing any sound at all.
My 5060 had no TV signals to worry aout for the first 6 weeks either. It's connected to my receiver (Denon 2807) by HDMI. Until last week, the only signal it got was from my DVD player (Denon 1920, HDMI to receiver for movies). No problems with black bars on the sides, just on the top and bottom. BTW, tried component but HDMI is much better for the DVD player and somewhat better for the sat box.
Now, the second HDMI on the receiver has a DirectTV H20 HD receiver connected to it. The receiver happily switches between sources and both sound and video pass through flawlessly. The PQ is very good. I've played with the settings and they are somewhat different for the two sources. At any rate, I'll have to write them down and post them here later. I'll be taking a crack at a real calibration after another 50 hours or so. In the mean time, the settings posted here have helped me out, so thanks to all who posted. people who have seen the 5060 are amazed for two reasons. First, I regularly hear "I didn't know HP made TV's." Then I put on a HD football or baseball game or maybe the second LOTR and show them the scene where the wall at Helm's Deep gets blown up. I have some pretty good speakers and the scene is a big WOW. Ain't just the sound though. The 5060 shows good detail in the dark night scenes of battle. There's lots of action (meaning rapid motion) in shadowy lighting. That's a good test of the contrast and quality of the set. Try it out if you get a chance.
Anyway, I'm happy with it.