If you want a heads-up on what SP2 will have in it then take a look here. It looks like Microsoft is trying to make a change at making their code a little bit safer. They don’t look like they are doing a knee jerk response (like in Outlook attachments) but this looks more thought out.
MSDN: developer view of Windows XP Service Pack 2. Beta coming soon.
[The Scobleizer Weblog]

Researchers at Duke have implanted a neural prosthesis in the brains of a monkey, connected same to a robot arm, and taught the monkey to work a third arm through the use of its mind. The