I became really interested in PIC late last year. It is near impossible to find information on it online due to the short, generic name. Google certainly has made naming projects for search-ability something to keep in mind.

Here are a few other links I collected:

http://www.cs.bell-labs.com/10thEdMan/pic.pdf - The PIC manual. Top result on Google for "bell labs PIC manual" but seems to be down at the moment.

http://figr.bzero.se/ - figr, an online PIC processor

http://www.kohala.com/start/troff/troff.html - some PIC (and troff) resources from the author of "Programming in the UNIX Environment"