Simply put, this will teach you what you need to know. It might not be directly applicable in US industry right at this moment, but you will be able to pick up just about any pic microcontroller and get started without much fuss at all after reading this. The guy who wrote it is a well known expert on the subject, both in industry and academically.
Let me know if you find any other good resources. I'm using PIC stuff for a senior design project.
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