The launch has begun in Edmonton and at the time of this writing the Keynote is being delivered. It is cold (-27 windchill), snowing and blowing but that did not deter the people of Edmonton from showing up in huge numbers. Just take a look at this overhead shot of the crowd and multiply it by three as there is equally large seating areas to the right and left!
If you haven't registered yet, head over to http://www.microsoft.ca/technet/launch2007 and hopefully there is still room left at the event in your city! You don't want to miss this!