We haven't yet been lucky enough to get our hands on Nikon's fast shooting D1H but Scott Audette (Pro Photographer) has posted four ISO 800 and ISO 1600 samples on his website. It has to be said that these are some of the cleanest, sharpest high ISO images I've seen from any digital SLR (including Kodak's DCS620x). I've checked the images and they are original and unaltered. Simply amazing.