Sean is at CERN right now. The seminar has started and you can follow what's happening live here.
You can also watch the live webcast directly from the seminar here. (It's quite technical.)
UPDATE: Here is the last part of the live-blogging (local Geneva time given here):
10:40 am (Sean): Personal editorializing by me: we’ve found the Higgs, or at least a Higgs. Still can’t be sure that it’s just the vanilla Standard Model Higgs. The discrepancies aren’t quite strong enough to be sure that they really represent beyond-Standard-Model physics… but it’s a strong possibility.
Fortunately, we have a great accelerator working at full speed, and much more data to come! A proud moment for everyone who has worked to get us to this point.
10:37 am (Mark): So we have a five-sigma result from ATLAS as well! This was well-worth getting up for, if only to take part, at great distance, in the joyous applause at this slide.
10:38 am (John): BOTH experiments have a significantly enhanced rate for gamma gamma. My raw impression is that this is not very Standard Model like at all…this is the most important thing I learned tonight, without question.
10:43 am (Sean): Fabiola thanks Nature for putting the Higgs where the LHC could find it.
At the end of her talk, now there’s even applause in the press room!
10:46 am (Mark): Peter Higgs is visibly moved at the final results. I hope people understand, and perhaps this helps make clear, how invested scientists are in this work.
10:47 am (Sean): Not often you get to see history made.
It's official: they have it!
Here is a screen shot of Peter Higgs saying a few words at the end of the seminar: