"I can not afford a D300" , "I want to buy a CMOS sensor, semi-expert D-SLR" , "I do not want to buy a D80"
Here is your answer.
12.3 MP, DX format CMOS Sensor, Live View, ISO200-3200 or 100 (Lo1.0)-6.400 (Hi2.0), very low noise, 4.5fps, 3" LCD screen, D-Movie Mode, GPS Geo-tracking, 1005 RGB Matrix metering, in camera image editting, self cleaning sensor,11 point AF Area.
This camera is a revolution in Dxx series compared to all "CCD sensor"ed D40, D40x, D50, D60, D70, D70s and D80.
Another revolution for nikon D-SLR's is capability of recording 720 pixel HD movie clips. This may sound weird for SLR users, but do not be spider head and enjoy the fruits of technology. I believe you will not use this mode often, but in case of need, this will eleminates to carry to cameras for recording/photographing purposes. I would like to remind you that this mode will suck your battery to the bones for sure.
Power up is 0.15 second, which is faster than a blink of an eye.
Compared to D80, D90 has new advantages like:
3inch LCD screen (D80 has had a 2,5inch LCD screen)
Having Live View mode
Video capture speciality
12.3 MP sensor (D80 has had a 10MP)
50% faster shutter - 4,5 fps (D80 has had 3fps)
GPS Geo tagging (optional with GP-1 GPS unit)
HDMI
Better battery life
Upgraded software and in-camera properties
Are you still reading? C'mon... Leave your computer and get one asap...
(Price tag - body only 990 US$/Euro)
Not finished !!!
A new DX lens released together with the D90 too.
AF-S Nikkor 18-105mm f/3.5-5.6G ED VR
I do not have any test or review note at the moment, but i may guess that it would be a cheap solution for zoom and kit lens seekers. My favorite is still 16-85mm VR and 18-200mm VR as a kit lens, but hope this one will have better results than this low-quality 18-135mm supplied together with D80's. But looking to price (300US$ in US), i may consider this lens as a regular kit lens with a plus only (VR) compared to 18-55mm and 18-70mm kit lenses...