I just got my first Electronic Design News, free to the industry magazine. 2 out of 3 articles in the Design Ideas section used PICs and referred me to there website for source code. Searchable articles and schematics are also there at no charge. Their description:
EDN's Design Ideas, contributed by practicing electronics engineers, deliver practical, innovative circuit designs in a concise format complete with circuit schematic diagrams, application details, and even software code. Design Ideas focus on topics/applications including analog functions, filters, power management, display drivers, FPGAs, microcontrollers, sensors, and much more.
**broken link removed**
They will let you sign up for other industry magazines that have inside information and sources that are usually unavailable to the mortal man.