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This link will get you to the Microsoft page that will let you know what is/is not included in SP3. Scroll down and open/download the Overview file you want.

http://www.microsoft.com/downloads/details.aspx?FamilyID=68C48DAD-BC34-40BE-8D85-6BB4F56F5110&displaylang=en

Also, Knowledgebase Article 936929 lists all other all Knowledge Base articles associated with updates that are included in Windows XP SP3. You can get the Knowledgebase article at the following link:

http://support.microsoft.com/kb/936929