Other web sites
Forums or other information resources on the net
http://www.thedmxwiki.com/ Has re-started, misc. terms explained, like CMY and RGB color mixing, Lighting Manual Archive and archives of some open source dmx software projects.
http://stagecraft.theprices.net/ The stagecraft mailing list, thousands of email threads per year! All technical stuff is discussed, from safety to cabling.
http://ww1.microchip.com/downloads/en/AppNotes/01076A.pdf Application note from Microchip on implementing a transmitter and receiver in a PIC microcontroller with assembler code.
If an example for Tx and Rx in assembler for AVR is needed, look here: http://www.hoelscher-hi.de/hendrik/english/demux.htm
Some DMX and Art-Net projects with Arduino. (In English and Spanish)
Arduino 4 universes DMX library: http://www.deskontrol.net/blog/arduino-four-universes-dmx-512-library/
Arduino DMX Art-Net node: http://www.deskontrol.net/blog/arduino-based-dmx-artnet-node/
Arduino Art-Net node for LED Pixels and digital led strips: http://www.deskontrol.net/blog/arduino-based-artnet-node-for-led-pixels/
If you know a useful resource, related to lighting tech, put it here!