Wow, this is awesome. When i originally posted, I couldn't find any posts on this tv line and now we have an official place!
I think the 2600 rocks as a computer monitor and I firmly believe that simply using the Sony driver and the TV's auto-sync is the best method for filling the screen. I have an ATI card and its works fine (I updated the drivers). Powerstrip was good, but there are too many things to try to fiddle with to get the screen *perfect* (I don't claim to understand all the settings or to be highly technically minded so I might be missing something- but I have built all of my PC's for the last 10 years and keep up to date on software and computer settings and like anything else, the simpliest solution tends to be the best). Try using the Sony driver and the native resolution setting will be available, then auto-sync.
As for cable, I FINALLY got my cable card (TWC in NYC stinks). Anyway, HD looks great but SD looks worse than my Panny plasma. Not that much worse but this confirms others who have told me that for TWC in NYC, set top box beats cablecard hands down (mind you I am comparing apples to oranges with my plasma and my LCD, but my neighbors have the Aquos LCD with the set top box and if the panels are the same, the picture is still superior using the box). However, I'm glad I got the cablecard for the bedroom for the simple fact that is a boatload cheaper.
BTW- I found using the auto contrast feature made the tv too dark when the lights are off and too bright in full sunlight. I think its best to turn off by that's just my experience.
Lastly, got the Chief wall mount and will be putting it up on the wall (instructions say its fine for drywall, and for a tv that's 25 lbs without the speakers, I believe them).