Now that a handful of lucky folks have gotten their hands on Windows XP Service Pack 3, we're starting to think you might not want to upgrade to Windows Vista anytime soon. Okay, we already kind of thought that, but it turns out SP3 includes a ton of security updates, some Vista code, and a couple of brand spanking new features for Windows XP:

• There's a new Windows Product Activation model that does not require you to enter a product key during setup.
• Network Access Protection modules and policies have been brought over from Windows Vista.
• There's a new module in the kernel that provides access to cryptographic algorithms.
• Windows XP can now detect routers that are discarding data.

Overall the update includes over a thousand patches to improve security, performance, and reliability.