I found this great Website that has slow motion video clips of some of the best hitters in baseball:

http://www.chrisoleary.com/projects/Baseball/Hitting/ProfessionalHitterAnalyses/SwingAnalysis_ChipperJones_CF_LH_1B_ToCF_001.html

He also has a section where he breaks down pitching mechanics too:

http://www.chrisoleary.com/projects/Baseball/Pitching/RethinkingPitching/Essays/ProperPitchingMechanics_GregMaddux.html