http://www.hobby-elec.org/e_pic.htm
This is a simple program that can be merged with other sources to allow easy in-circuit debugging.
http://members.home.nl/b.vandam/lonely/pagina8.html
http://www4.tpg.com.au/users/talking/25mA.html
10 tricks
http://www4.tpg.com.au/users/talking/10 Tricks for 508A.html
http://chaokhun.kmitl.ac.th/~kswichit/isolated/isolated.htm
http://www.mindspring.com/~tcoonan/lcdpic.html
This observation is about a machine (pic) learning a sequence from another machine (pic), without any human intervention and with no more feedback than a percentage correct.
http://members.home.nl/b.vandam/lonely/pagina16.html
Building a stable noise generator for audio-frequency purposes requires only a few components. This circuit relies on linear-feedback shift registers and some simple software.
http://www.edn.com/article/CA313057.html
http://www.piclist.com/images/com/multimania/www/http/silicium31/Electronique/PIC/schematics.htm
uses a PIC16F84 micro and MAX3100 UART to impelement 256 address RS-485 bus transceiver
http://www.edn.com/article/CA179575.html