LCD and Viewfinder
Canon D30 has a Fixed Type 1.8" LCD screen with a resolution of 120k dots. At only 1.8", the screen is on the smaller side and 120kdot resolution is lower than most of the recent models in this class.
D30 has a built-in Optical (pentaprism) viewfinder. The viewfinder has a coverage of 95% and a magnification ratio of 0.55x. 95% coverage means that what you see in your viewfinder while shooting will slightly be different from the actual image.
Max Shutter speed
Canon D30 can shoot continuously at max speed of 3 fps
and has max shutter speed of 1/4000 sec
D30 has a built-in flash, and it also has a flash shoe to mount your external flashes too.
Canon D30 features a Phase Detection autofocusing system. The AF system has 3 points to choose from.
Unfortunately Canon D30 doesn't have Video recording ability.
Connectivity and Storage
Canon D30 has a USB 1.0 (1.5 Mbit/sec) port to connect your camera to other devices.
Canon D30 Features Compared to Main Competitors
You can download Canon D30's User Manual here