Around these parts, though, we're mostly celebrating Particle Announcement Day at CERN.
Londoners: The Royal Society Summer Exhibition is on again this week. I'll be there this afternoon (1330 to 1700, when it closes to the public) along with purplecthulhu and tomorrow morning (Thursday, 1000 to 1330) on the Herschel stand. I realise this is work-time for most of you, but the exhibition is open late to the public on Friday and also at the weekend. Come on down to Carlton House Terrace and see the new and exciting things going on in science!
ETA: We're watching the CERN webcast in the lab. It is hilarious watching the dance between the press and the scientists. The press are practically begging for them to say without qualification that this is the Higgs boson. The scientists are steadfastly refusing.
Now that I've been watching for half an hour, I can sum up the interaction thusly.
Press: "Please, please say this is the Higgs. PLEASE."
Scientists: "Here is a technical explanation of the reason why we refuse to define this particle as the standard-model Higgs."
Press: "OK, if you won't do that, will you at least help us with our headlines by saying something about dark matter?"
repeat ad infinitum