we did not server upgrade, we did just a layout change :-) and FYI it was planned since 3 months ago that the change would happen at the same time the keynote was taking place in NYC so that there would be a before and an after the talk. If we got Slashdotted is a happy coincidence, but our server is ready to take Slashdot once a day if needed (we do pay for a pretty reliable server).
Also as a side note, we registered over 20Gb of page traffic during the weekend, which is about 4 times the normal amount. I guess it is the added factor of the new boards, Slashdot, and so on ... however our server was never over 50% capacity and the downtime for the layout's update brought a total downtime of 35 minutes.
We learned the hard way, since we were Slashdotted a year ago and then we had a serious problem :-)