Matthew Yohe provides us with this photo from the front of the keynote line. As of 10pm, there are approximately 20 people in the line. Regular conference pass people are in a separate line from the Super/Platinum Pass folk. Sadly, without keynote media access, I'll be joining them soon.
4:20 am PST Update: The line now stretches down the entire south side of Moscone West. I estimate a couple hundred people are in line, and we still have over 5 hours to go. The Super/Premium Pass line, however, is relatively small at only 30 or so.