XP SP3 has been released into the public domain after a short delay. Get all the info, and the updates themselves, by following this link:
There's also an interesting whitepaper available, entitled Windows XP Service Pack 3 Overview, which you can pick up from here:
My favourite improvement within XP SP3 is the Network Access Protection integration:
"NAP is a policy enforcement platform built into Windows Vista, Windows Server 2008, and Windows XP SP3 with which you can better protect network assets by enforcing compliance with system health requirements. Using NAP, you can create customized health policies to validate computer health before allowing access or communication; automatically update compliant computers to ensure ongoing compliance; and optionally confine noncompliant computers to a restricted network until they become compliant. For more information about NAP, see Network Access Protection: Frequently Asked Questions."
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