Alright, I just tried some more 3d on my 54VT25, and here is what I'm finding:
I watched some 3d on the Comcast channels - First a 3d basketball game, and then Sigfried (sp?) and Roy Magic thing - something or other history of them, but which included a lot of dramatic images of them set in front of a black/dark background.
The basketball game was pretty good. I saw no discernable ghosting/crosstalk, really. It's a pretty bright broadcast, it looked great.
The Sigfried and Roy show had a number of scenes with dark background. And, though the bright scenes looked just fine, anything with a 3d image against a dark background started to demonstrate distinctive crosstalk/ghosting. There was the main 3d image in the foreground, with the dark background. And . . . On either side, I saw the ghosting/crosstalk. I tested it by closing one eye and then the other. When I closed the left eye, I saw the main 3d image, with a shadow/crosstalk to the right (faint, but annoyingly and clearly there). When I closed the right eye, it was the main 3d image, with a shadow/crosstalk to the left. Both eyes open . . . I saw both the left and right shadows on either side of the main/intended 3d image.
Based on this, it really seems to me that the problem is that the active glasses simply cannot block out all of the light when the right or left lenses are supposed to be blocked. When you've got a bright image like basketball, these shadows are less apparent, often not notice-able.
But, when the intended 3d image is in the forefront of a dark background, then the apparent limitations of the lcd glasses are unavoidable - you see both the left and right shadow/crosstalk. It's not that the glasses are out of synch, it's that the "blocking" of each eye, by the lcd becoming momentarily "black", is not truly and completely black. In essence, we're back to the initial problem of lcd displays - they can't block all the light!
In sum, my understanding of these 3d lcd glasses, is that they very quickly black out their lenses, alternating the right/left, right/left, etc. They are in sync with the TV via IR, where the TV is at the exact same cadence/frequency, showing a left eye image when the right lens is blocked out, and then showing a right eye image when the left lens is blocked out. The idea is to quickly alternate back and forth, so that the right eye only sees the TV image meant for the right eye (while the left eye is blocked by a "closed"/black LCD in the left lens), and the left sees only the TV image meant for the left eye, while at that exact instant the right eye lens is momentarily "blacked out" via lcd becoming "black" in the right eye.
This all is great, unless the lcd glasses can't achieve full black-out as they alternate left/right closing.
And . . . I think that's the problem. The lcd lenses in the glasses simply do not completely block out all light when they're "closed"/black. They block out most - but, as we know about lcd TVs and their black levels (especially early models), they do not block out all light.
So, if the image is bright, the 3d effect is not affected, because the image slightly leaking through the not completely black "blocked" lens is subsumed in the rest of the bright background.
But . . . . with an all black or just a mostly dark background, any 3d image intended to appear in "front" of such a dark image gets compromised, because the lcd lens "closed" state cannot fully block out light when it is in its closed state. As a result, you see the ghosting/crosstalk in such dark backgrounds as a result of the inability of the lcd lenses to block all of the light coming into the eye that is supposed to be blocked at that moment.
My conclusion, then, is that this 3d active stuff with lcd glasses will never eliminate this cross-talk/ghosting in a dark background scene especially until they somehow develop fast-reacting LCD (or other tech) lenses that truly can block all light. Until then, on dark backgrounds, there will always be crosstalk/ghosting due to the light leaking through the "closed" state of the lenses.
I think this is a huge problem, with the current systems - my pansonic plasma included. And I don't think it can be fixed with current technology. Best thing is, right now watch more brightly colored, or subtle 3d content (like Avatar, which looks great on my TV in 3d) and avoid dramatic examples of 3d, where there is a lot of black or dark background behind the intended 3d image.
That's what I think, at least.