Yes, the Nikon D90 records 720p HD video at 24 frames per second with monaural sound, making it the first DSLR to offer movie capabilities.
No, the Nikon D90 features a DX-format (APS-C) sensor, which has a 1.5x crop factor compared to 35mm full-frame sensors.
The Nikon D90 uses the EN-EL3e rechargeable Li-ion battery, providing approximately 850 shots per charge according to CIPA standards.
Yes, the D90 features a built-in autofocus motor, allowing it to autofocus with older Nikon AF-D series lenses that lack internal motors.