Microsoft begins beta testing Vista service pack
Microsoft on Monday said it has released a beta version of the first service pack of Windows Vista to about 12,000 testers.
Microsoft had said back in August that it expected to start private testing of the service pack within a few weeks. The update is largely a collection of bug fixes and performance and compatibility improvements, but includes some minor new features such as support for the ability to encrypt multiple hard drive partitions using Vista's BitLocker feature.
Yes, unfortunately it's a private beta, but who wants to bet how long it will be before it is leaked?