Joe Paradiso's Electronics Primer Notes (updated by Michael Sung)
Useful Electronic Parts and Circuits Information (scanned by Michael Sung)
Simple Pseudo-Random Sound Generator Example
Driving Stepmotors (by Axel Kilian)
Color coding of resistors (by Saoirse Higgins)
Web sites used for help with circuit design (by David Merril, Kyle Steinfeld):
http://www.findchips.com/
http://www.digikey.com/
http://www.google.com/PIC
http://www.TI.com
Midi stuff:
http://fargo.itp.tsoa.nyu.edu/~tigoe/pcomp/pic/pic-midi-pbpro.shtml
http://www.midi.org/about-midi/abtmidi.htm
http://www.weir.net/~mwhitco/ http://www.cs.princeton.edu/courses/archive/fall02/cs436/InputMIDI/midielec.html
useful book: "Practical Electronics for Inventors" (good theory explanations, bad schematics)