Below is a list of resources that I think you will find very helpful:
1.American Academy of Physician Assistants
http://www.aapa.org/
2. Physician Assistant Forum
http://www.physicianassistantforum.com/
3.CASPA
https://portal.caspaonline.org/
4.Physician Assistant History Center
http://www.pahx.org/
5.National Commission for the Certification of Physician Assistants
http://www.nccpa.net/
6.PA Programs
http://www.paeaonline.org/
7.American Association of Surgical Physician Assistants
http://www.aaspa.com/
8.US Department of Labor: Physician Assistants
http://www.bls.gov/oco/ocos081.htm