If I had a “Quote of the Week” blog this would take it. Read what a fellow SBSC Partner (I would tell you his/her name but the Live Space tell me) wrote about the 11th hour pulling of XP SP3.
“Nearly 3 years in development, 1 year in testing and they find out the day of release it crashes, you ready for this, Microsoft Retail Management Software! They didn’t even freaking test it against their own products?!!!”
So while SP3 will not be in your Updates list you can get it here.