Did you do it recently?
About 5 weeks ago. In fact I had added a new HP notebook to the networks and it started downloading the SP2 pack automatically, I caught it immediately as I meter IP traffic. That was annoying, but hey it's MS so I pulled it faster than a DU troll.
Once away from the network and proceeded the SP2 upgrade - since it was a new machine I had nothing to lose. Did the rest one at time, not even a sniffle.