My upgrade was pretty easy. However I have seen some changes in the way some of the OOTB workflows behave. I use the Default Submit WF for my config branch and it is not working (deployments) since SP1 was loaded. I have a support case open for it.
We have the Same issue. Installing Teamsite on W2k3 SP1 on a HP DL580 Server fails, due to the iwserver.exe service crashes.I didn't have this problem on another machine with W2k3 SP2.regardsJörn