Problems with XP SP3
There have been a few reports of people having reboots after upgrading their XP systems to SP3. Considering the frequency with which this occurrence seems to be observed, particularly amongst those with AMD processors it does beg the question whether Microsoft applied the proper rigor to their pre-release testing.
While we have come to expect that new software releases from MS have been a little less than bug-free, there has been an expectation that service packs offer a greater degree of reliability.
If you are having trouble with the XP SP3 upgrade, blogger Jesper Johansson has a great page detailing some of the problems that have been encountered and how they can be circumvented. It will be interesting to see how this issue plays out over the coming weeks. I would expect MS to be fairly quick with a patch.