Here is a chart comparing the previous and latest models from Nikon and Canon:

Model Nikon D80 Nikon D90
Sensor 10.2 MPCMOS 12.3 MP CMOS
A/D conversion 12-bit 12-bit
Focal-length multiplier 1.5x 1.5x
Shutter speeds 30-1/4000s 30-1/4000s
Flash Sync 1/200s 1/200s
Continuous shooting rate 3 fps 4.5 fps
Sensitivity range 200-1600 (plus 100, 3200) 200-3200 (plus 100, 6400)
Memory Type SD(HC) SD(HC)
Viewfinder 95% coverage
0.94x magnification
fixed focusing screen
96% coverage
0.94x magnification
fixed focusing screen
Autofocus 11 point AF
Single center cross-type
11 point AF
Single center cross-type
Live View No Yes
Movie Mode No Yes (5 minutes max, fixed exposure, no AF)
Dust reduction system Dust reference image Vibrating sensor
Dust reference image
Anti-static coating
LCD pixels 230,000 920,000
LCD size 2.5″ 3″
Shutter durability less than 100,000 cycles? 100,000 cycles
Availability Current ~ September 2008
Price (street, body only) ~ $731nikon digital camera Nikon D80 and Nikon D90 comparison chart ~ $999nikon digital camera Nikon D80 and Nikon D90 comparison chart