LCD and Viewfinder
Nikon D3 has a Fixed Type 3" LCD screen with a resolution of 922k dots. Both the screen size and the screen resolution is up to the standards of this class.
D3 has a built-in Optical (pentaprism) viewfinder. The viewfinder has a coverage of 100% and a magnification ratio of 0.7x. 100% coverage ensures that what you see in the viewfinder while shooting matches exactly what you will get later in your image, helping accurate framing your shots and minimizes the need for cropping images later.
Max Shutter speed
Nikon D3 can shoot continuously at max speed of 11 fps
and has max shutter speed of 1/8000 sec
Unfortunately D3 doesn't have a built-in flash but it has a flash shoe for mounting external flashes.
Nikon D3 features both Contrast Detection and Phase Detection autofocus (AF) systems which ensures speed and accuracy of focusing in most situations. The AF system has 51 focus points and 15 of these sensors are of Cross-type. Cross-type sensors locks focus faster and more accurate compared to single type sensors.
Unfortunately Nikon D3 doesn't have Video recording ability.
Connectivity and Storage
You can connect D3 to compatible devices via its HDMI port or USB 2.0 (480 Mbit/sec) port.
Nikon D3 is powered by a proprietary battery which provides a shooting life of 4300 according to CIPA standards.
Considering that the average battery life of DSLR type cameras is 943 shots, Nikon D3 has a good battery life for its class.
Battery Life Comparison in Pro DSLR Cameras
Nikon D3X with its 4400shots is the model with longest battery life among Pro DSLR cameras. Check the comparison of Nikon D3 vs Nikon D3X or take a look at Longest Battery Life DSLR cameras list.
Nikon D3 Features Compared to Main Competitors
You can download Nikon D3's User Manual here