Physics On-Line:

• 
• Physics World
• The Laws List
• Astronomy Picture of the Day

Resources:

• arXiv.org
• Physical Review Online Archive
• American Journal of Physics
• SLAC SPIRES (hep),
• KITP Online Talks
• Particle Data Group
• CERN
• Fermilab
• NNDC

Education:

• Physics FAQ
• ParticleAdventure.org
• Fermilab Education Office

Organizations:

• KITP, APS, AIP, NSF, NASA, JPL