Found this while still looking for a demo of the handwritten annotation feature. Seems like a pretty full service hands on demo of the features. Also compares the 600 to the 505 (as we all know contrast is not as good), however, additionally there is a comparison to the Kindle DX and here there is virtually no contrast difference in the video - there is still some additional glare it looks like on the 600 though. They also state it is nowhere near as bad as the 700 but interestingly enough they don't show you that.
http://www.mobiletechreview.com/ubbt...p?Number=34238
Mel