Here are links to some useful particle physics resources

• The Particle Data Group
• HEPIC
• Particle Physics in the UK
• STFC
• CERN
• SLAC
• Fermilab
• KEK
• Paul Harrison's CP Violation Article
• Physics Web
• IoP Main Website
• SPIRES preprint search facility
• PPD at RAL
• The Ultimate Neutrino Page
• Wolfram Research's Mathworld site