If you install the beta of Windows Vista Service Pack 2 (SP2) expecting to see visible changes to your version of Vista, you'll be sorely disappointed. At least in this initial beta, all the changes are under the hood, and even they are far from earth-shaking.
Microsoft says that it has fixed compatibility problems with the third-party Spy Sweeper and ZoneAlarm security applications, enhanced hardware support for Direct X, improved Wi-Fi connections after a system resumes from sleep, improved Windows Search, added support for the newest Bluetooth specification (2.1) and rolled up all previous Vista updates.
But at the same time we should not forget that this is an initial beta and things may change gradually in the final release. The Notable Changes Document highlights the various improvements and enhancements in this current beta release.
The Windows Vista SP2 Beta and Windows Server 2008 SP2 Beta Test Focus Guide focuses on various factors for evaluating this beta. You can provide your valuable feedback and submit bugs for SP2 at the Microsoft Connect website.