In John Parson's words (via live chat at Scientific American), this is the atmosphere at CERN right now. Celebration everywhere, even as more information is released, and bigger questions emerge. What does this mean for supersymmetry? and for string theory? are there other "higgslike" bosons? is 14 TeV a high enough operating energy for the LHC to find answers when it restarts in 2015? will the anthropic principle play a role?
Catch up on all of today's reaction here, here, here, here, here. Images from CERN here; video footage here; interview with Francois Englert here.