Most notably:
- try the Display Settings for Full RGB. This should give a huge boost in color range and contrast, and make Planet Earth look even better. If there's no obvious difference or it only gets darker with no improvement in color range (i.e. the brights also get darker), your TV maybe supports Super White instead, and you can try that option.
- some of the sound options, there's a Bitstream Type 3 option you can choose that can sound better for instance. I don't know the details of this one, exactly. Ditto for Audio CD output, there are some settings like upscale to 172hz and such. Again, here you'll have to experiment, or ask someone more knowledgeable than me, or go to AVForums.
I setup Super-White since my TV supports it and "Full" for the RGB options.
Btw, Paul keeps trying to get me to download the Uncharted demo and give it a whirl. Maybe if there are any games out there that are demos that really show off 1080p content, I'd be interested though. Seems like everything is 720p.