In addition to those improvements, there are a few others worth mentioning:
D2Hs vs D2H
3D Matrix Metering II vs 3D Matrix Metering
Continuous Shooting Up To 50 JPG/40 NEF vs 40 JPG/25 NEF
ASIC Image Processing 12 Bit vs 8 Bit
sYCC Color Space Support Added
EXIF 2.21 (and DCF 2.0 & DPOF) vs EXIF 2.2
Wireless Remote Control Added
802.11g Added (WT-2) with PTP/IP
Flicker-Free 232K pixel TFT LCD vs 211K pixel
Help Menu Added
15x Playback Magnification vs 8x
RGB Histogram Added
Recent Settings List (D2X) Added
World Time Function Added
Modified Vertical Shooting Buttons
Paid two days ago from a local premium camera store $1400 for a very clean D2H.
Why do you want to move from the D1 to the D2H? Properly lit I find the D1 easier to use. Yeah laugh at me, but the D1 has never failed me. Low lights, yes, more MP, yes, the D2H is better, but the D1 is one heck of a camera.
Dial it in and it goes. Believe it or not I find the metering on the D1 more consistent than on my D70 and D2H - I have to be doing something wrong.