If you find yourself wondering, "Why all the effort? My computer works just fine without XP and Service Pack 2, and I've heard some unsavory comments about SP2 and such, so why don't I just dance with the one that brought me?" Well, this chunk should address your concerns.
For those vacillating over whether to upgrade to SP2, you might want to keep this list handy. It contains the top 10 reasons (at least from Microsoft's perspective) about why you need to make the upgrade. Upgrading to SP2