LCD and Viewfinder
Nikon D3000 has a Fixed Type 3" LCD screen with a resolution of 230k dots. Both the screen size and the screen resolution is up to the standards of this class.
D3000 has a built-in Optical (pentamirror) viewfinder. The viewfinder has a coverage of 95% and a magnification ratio of 0.53x. 95% coverage means that what you see in your viewfinder while shooting will slightly be different from the actual image.
Max Shutter speed
Nikon D3000 can shoot continuously at max speed of 3 fps
and has max shutter speed of 1/4000 sec
D3000 has a built-in flash, and it also has a flash shoe to mount your external flashes too.
Nikon D3000 features both Contrast Detection and Phase Detection autofocus (AF) systems which ensures speed and accuracy of focusing in most situations. The AF system has 11 points to choose from.
Unfortunately Nikon D3000 doesn't have Video recording ability.
Connectivity and Storage
Nikon D3000 has a USB 2.0 (480 Mbit/sec) port to connect your camera to other devices.
Nikon D3000 is powered by battery which provides a shooting life of 500 according to CIPA standards.
Considering that the average battery life of DSLR type cameras is 886 shots, Nikon D3000 has a short battery life for its class so we strongly recommend D3000 owners to buy some extra batteries.
Battery Life Comparison in Entry-Level DSLR Cameras
Pentax K-x with its 1900shots is the model with longest battery life among Entry-Level DSLR cameras. Check the comparison of Nikon D3000 vs Pentax K-x or take a look at Longest Battery Life DSLR cameras list.
Nikon D3000 Features Compared to Main Competitors
You can download Nikon D3000's User Manual here