Some good resources already pointed out.
Ron Wolforth's Combat Pitcher=Have used it at the JUCO level and seen good results with velocity improvement and arm care. The program is not cheap and requires some equipment though.
Jaeger= We have used his info in our long toss program and routine.
Ellis=Good site with some very good info on all areas.
Good site for pitching video clips=http://www.pitchingclips.com/
Chris Oleary has some good info on his site=
http://www.chrisoleary.comGood site on shoulder care and Jobes routine=
http://www.rbjc.com/Includes/D...lder%20Exercises.pdfNPA (National Pitching Association) =http://www.nationalpitching.net/
There are many more but hope this gets you started.
-Maryland Mud Dogs Baseball