Finally got around to installing SP3 on my automation server and was rudely greeted by a crash and reboot when I tried to RDP onto the machine. Reading the minidump confirmed RDP was somehow to blame. A quick Google revealed there's some incompatibility with some ATI (and Nvidia) graphics drivers and SP3's remote desktop. I installed the latest ATI drivers from AMD's site. We'll see what happens.
Update 5/5/09: Nope that didn't fix it. It still crashes when I RDP to it.
Update 6/9/09: It appears to have something to do with RDP color depth. 15 bits will cause a fatal, but keeping it 16 bits or higher doesn't.