When some of you guys think you're seeing inflated black levels, you might want to double check. Get up really really close to the screen (few inches away) and confirm there's no activation/dithering/crawling noise on the blank input or black pattern (dancing red/green pixels on black). I've noticed on the S1, something my cable box is doing is causing the correct brightness setting to change really dramatically--presumably something it's doing shifting levels between SD and HD. This certainly gives the impression your blacks levels have exploded, but it just seems to be a glitch with video levels. You can calibrate it out completely, and it corrects when you turn the source on (at least for HD, it may still blow them out with SD). I think some reviews have actually complained about this. Kinda strange though, the G10 stays uniform across an SD Wii (Component), SD/HD Cable (straight Coax), and a variety of HDMI devices.
In any event, it doesn't seem to have anything to do with the original problem, just an observation that could be the source of some false positives. I just noticed a lot of people are using blank inputs as metrics, paired with cable/sat boxes, and talking about how their levels normalize when there's content up. I suspect this is what some of you are seeing.