Was testing the beta some time ago. Today its released to public via website and Windows Update.

I didn’t feel any performance improvement as speculated by some, but its worthwhile to note that SP3 has need security features (which helps verify you are indeed connected to the intended computer) for you to remote connect to Windows Server 2008 and also Vista.

For developers WinXP SP3 comes with Microsoft Management Console (MMC) 3.0 which you can create .NET based plugin to.

Download it directly.

PC Magazine’s review

More info from Microsoft