I played with it a little more.
I tried Game Mode, but to me, it seemed to "blur" the image a lot, so I am not using it right now for SD viewing.
I setup the HDTV antenna, picked up NBC, CBS, FOX and PBS HD. These channels all look amazing! Watched Law and Order SVU and since it was also coming on the SD, I was able to switch back and forth between the two channels and see the difference, WOW! NONE of the sets at Best Buy and Circuit City looked as good as it does at my house, those stores need to do something to set the picture up right, or get a better feed, or better video amplifiers, I dunno, something.
I also connected my PowerBook to it, the picture, agian, was amazing. The native resolution on my PB is 1280x854 and it displayed correctly on the Sony, clear text, vivid color. I played a HD video off the PB (720p version of the new Final Destination 3 trailer :) ) and it looked terrific, just like those HD feeds.
I didn't play with it anymore than that, but I guess I have time to get into the nitty gritty :)
BTW, I really dislike the looooooong remote that is supplied with it, so I guess Harmony will be seeing a visit from me soon ;)
I will definately post views of this TV when I pick up my 360 (might take a few days for me to tear away from it though).