Last night we were down for about ten minutes. As long as Blackboard hosting services had to re-boot the cluster anyway they decided it was an appropriate moment to add two more application servers (brings us to 8). This morning we appear to be running much more quickly, so that seems to have helped.
I think you can expect some slowness Monday and Tuesday next week as the remaining 8 colleges start classes, but once those days pass we should be past the really tight spots.
We are still planning on upgrading to application pack 2 September 22nd, so please don't set due dates for Sept 22-24.