I thought I would get this up here since people on the scene are reporting police intend to kettle the marchers soon. I'm only seeing a march with police presence right at the moment but this bears watching as there have been several arrests already at the National Gathering.
Free desktop streaming application by Ustream
2:49 PM PT: I'm not seeing this live stream. Here is the available video from the march. I will keep checking back in to see if the livestream is back up.
Video streaming by Ustream
4:27 PM PT: Live video for mobile from Ustream