Viper's Lair has posted an Office XP SP2 slipstreaming guide
If you have not installed SP1, no need to worry as SP2 contains ALL previous fixes and service packs. You will have to download the Administrative Update, which weighs in at a hefty 50MB. If you've already slipstreamed SP1, don't worry, you can slipstream SP2 into the SP1 installation.Read more