Super fun interactive particle physics games by the folks at CERN (European Organization for Nuclear Research). Explore the particle accelerators!
Video: Brian Greene and Lawrence Krauss discuss the Higgs Boson at the World Science Festival.
Read about the Higgs Boson and it's significance from the particle accelerator laboratory that discovered it.
PBS Atom Builder Interactive Site (requires Shockwave) -- featuring the "guide to elementary particles" and "building stable atoms". Also includes a glossary and a link to biographical information for scientists and their relevant discoveries. This interactive lets you use quarks to build particles and also build radioactive and stable atoms. See it here.
A basic atom-builder activity that's perfect for beginners (works great on a whiteboard).
Free downloadable atom builder app, Build an atom out of protons, neutrons, and electrons, and see how the element, charge, and mass change. Then play a game to test your ideas!