Commercial:

• Agilent
• Analytica of Branford Inc.
• AB SCIEX
• Bruker
• Jeol
• Kratos Analytical
• Mass Spectrometry International
• Mass Spectrometry Related Companies
• Scientific Instrment Services Inc.
• Shimadzu
• Sierra Analytics
• Thermo
• Waters

Resources:

• A History of Mass Spectrometry
• Base Peak
• i-mass.com
• Jeol's tutorials in mass spectrometry
• Mass Spectrometry
• University of Arizona's introduction to mass spectrometry
• Usenet Mass Spectrometry Newsgroup

Journals:

• Analytical Chemistry
• European Journal of Mass Spectrometry
• International Journal of Mass Spectrometry
• Journal of the American Society for Mass Spectrometry
• Journal of Mass Spectrometry
• Mass Spectrometry Reviews
• Rapid Communications in Mass Spectrometry

Societies:

• American Society for Mass Spectrometry
• British Mass Spectrometry Society
• Canadian Society for Mass Spectrometry
• European Society for Mass Spectrometry
• International Society for Mass Spectrometry

Software:

• Composer
• mMass
• Peacock
• GNU polyxmass

Employment:

• British Mass Spectrometry Society jobs page
• VRS Mass Spectrometry and Separation Science Recruitment Consultants

Facilities and Groups:

• Biological Mass Spectrometry, UW
• Institute of Mass Spectrometry, University of Warwick
• UCSF Mass Spectrometry Facility