There are free Windows XP Service Pack 2 E-Learning Clinics, located at https://www.microsoftelearning.com/xpsp2/

So if you are an IT-Pro or Dev and you want to get up to speed on whats included in XP SP2 , the clinics includes the following sessions:

Clinic 2851: Deploying and Administering Microsoft® Windows® XP Service Pack 2
Summary: This online clinic provides students with the knowledge and skills to successfully implement Microsoft® Windows® XP Service Pack 2 (SP2) in medium- and large-scale environments. It provides information about the new security features included in SP2 and discusses how those changes may impact end users. The clinic also shows how SP2 can be deployed in an enterprise environment, how to prepare for deployment and how to manage SP2 after installation.
Audience: IT Pro
Clinic 2853: Developing and Maintaining Applications on Microsoft® Windows® XP Service Pack 2
Summary This online clinic provides students with the knowledge and skills to understand the security enhancements included with Microsoft® Windows® XP Service Pack 2 (SP2) and how these features may affect applications that need to run on Windows XP SP2. The clinic will also discuss implications for working with application development tools including Microsoft Visual Studio® .NET and how to configure the Windows XP SP2 development environment.
Audience: Developer

And also my blog covers some of the high level items that you may find useful. They are listed under the category of SP2!