This is a good summary page of the datasheets and errata.
Hopefully this will be helpful to the people here.

PICmicro(r) Datasheets and Errata Documents
PICC supported chips (PIC12/14 architecture or PIC12F/16F)
http://www.htsoft.com/resources/picc_datasheets.php

PICC18 support chips (PIC16 architecture or PIC18F)
http://www.htsoft.com/resources/picc18_datasheets.php

dsPICC supported chips (dsPIC)
http://www.htsoft.com/resources/dspicc_datasheets.php

Regards,
Xiaofan

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