McMaster University
Mc Master University: Music Composition for Beginners
A brief site on the advent of technology changing how music is written (and by whom) forever. One bad point is that for most of the links to work, you have to figure out for yourself where they go and type it in.
Other
Composing Music Using Computers
Understanding MIDI, digital audio, and how to compose using both. Although this site is from 1996, much of the information remains relevant.