Microsoft's XP Service Pack2 is out, but very hard to find on Microsoft's site. They probably did this on purpose to prevent an onslaught of people downloading the service pack. They want you to use Automatic Updates to "slowly" download the service pack in the background.
But if you just can't wait, you have a couple of options.
First, you can click this - from Microsoft's official website: Microsoft Windows XP SP2 download
Or if you are familiar with BitTorrent (a fast P2P network) you can download Service Pack 2 here:
Download the Windows XP Service Pack 2 via BitTorrent