I'm really not going to be in any hurry to install SP2 for Windows XP. Doing mostly Web development, there are all kinds of new security “features” that could potentially cause me all kinds of setbacks. Don't get me wrong, I agree with the need to block annoying popups and increase security - I just don't want to have setbacks supporting apps that break the new rules.
Microsoft has once again delayed its rollout due to quality concerns. Not much of a confidence builder. I think I will stay in “wait and see” mode, so post some feedback in a few months if you are brave enough to install it on your production machine. :-)