Nature have a nice web site section on the LHC.
Specials : Nature News: “The Large Hadron Collider is the world’s most powerful particle accelerator. As the first proton beams zipped around the LHC’s massive 27-kilometre ring on 10 September 2008, it marked a new era of physics that could pin down the identity of the dark matter that shapes galaxies; find the Higgs boson, believed to confer mass on the other particles of the quantum bestiary; and recreate conditions that existed a split-second after the Big Bang. In this online Special, Nature asks how it works, what it will find, and why we should be excited.”
(Via Nature Journal.)