I've successfully installed Release to Manufacturing (RTM) version of Service Pack 1 for Windows Vista. This version will be the exact same version which will appear in March final version. The installation of the service pack took about 1 hour. During the installation process, Windows restarted for quite a few times (3 times I think, and I still don't understand why it needs so much restart).

My Windows Vista is an *ehem2* version, and yet, it is still functioning after the installation of service pack.

For those who need to *ehem2* their Windows Vista, try this. OEM_BIOS_Emulation_Toolkit_For_Microsoft_Windows_Vista_X86.v1.0-PARADOX

Er, I forgot where I found this, if you need the x64 version, you need to find it on your own. USE AT YOUR OWN RISK!

[Download: OEM_BIOS_Emulation_Toolkit_For_Microsoft_Windows_Vista_X86.v1.0-PARADOX]

Sticking back to the topic, here are the changes in Windows Vista Service Pack 1 (from Wikipedia):
- new hardware and software standards, notably the exFAT file system
- 802.11n wireless networking
- IPv6 over VPN connections
- Secure Socket Tunneling Protocol
- An updated version of Windows Installer is included that provides support for multi-package transactions and embedding the user interface of a child Windows Installer package inside a parent installation session
- Booting a system using Extensible Firmware Interface on x64 systems is also being introduced; his feature had originally been slated for the initial release of Vista but was delayed due to a lack of compatible hardware at the time.
- An update to DirectX 10, named DirectX 10.1
- The Group Policy Management Console is being replaced by the Group Policy Object Editor

[Microsoft Windows Vista] [Announcing the RTM of Windows Vista SP1 @ Windows Vista Blog] [Download Windows Vista Service Pack 1 RTM]