Here are some resources that I use. Click on sub-tabs for further details on such topics as back mechanics and posture.
Links for further information on
Physical Medicine and Rehabilitation: http://www.aapmr.org/
Acupuncture: http://www.medicalacupuncture.org/index.html
Any medical question:
http://www.ncbi.nlm.nih.gov/pubmed/
Check drug -drug or drug-herb interactions: http://www.drugdigest.org/wps/portal/ddigest