http://www.cnczone.com/ - a resource for engineers, hobbyists who want to build their own CNC.

http://www.discovercircuits.com/  - a resource for engineers, hobbyists, inventors & consultants containing a collection of  12,000+ electronic circuits or electronic schematics cross-referenced into 500+ categories plus an extensive electronics engineering resource section. 

http://ourworld.compuserve.com/homepages/Bill_Bowden/  - A small collection of electronic circuits for the hobbyist or student 

http://www.elecdesign.com/  -  Electronic design magazine

http://www.elektor-electronics.co.uk/  -  Popular electronic magazine

http://www.microchip.com/  -  Manufacturer of PIC microcontroller

http://www.winpicprog.co.uk/  - PIC tutorial and programmer

http://www.piclist.com/  -  Source for PIC and other microcontroller codes.

http://www.dakeng.com  -  Home of TurboCNC, the best shareware CNC controller around!

http://www.sanyodenki.co.jp/steppdf/2step_e1.pdf  Sanyo Denki stepper motor selection datasheet

http://www.motionnet.com/  -  Engineering directory

http://www.howstuffworks.com/  -  If you are curious on how something works