If you are having Windows Vista then its good news for all of you.Microsoft has released Windows Vista Service Pack 2 RC and is now available to general public for download. You can download the SP2 RC for Windows Vista.
Service Pack 1 is a prerequisite for installing Service Pack 2. Please make sure that your system is running Service Pack 1 before you install Service Pack 2.

Features of Vista   SP2 :
# SP2 adds support for the 64-bit central processing unit (CPU) from VIA Technologies, which adds the ID and vendor strings for the new VIA 64-bit CPU.

# SP2 integrates the Windows Vista Feature Pack for Wireless, which contains support for Bluetooth v2.1 and Windows Connect Now (WCN) Wi-Fi Configuration. Bluetooth v2.1 is the most recent specification for Bluetooth wireless technology.

# SP2 improves performance for Wi-Fi connections after resuming from sleep mode.

# SP2 includes updates to the RSS feeds sidebar for improved performance and responsiveness.

# SP2 includes ability to record data to Blu-Ray Disc media.

Download Links:

Download: x86-32
Download: x86-64
Download: ISO Image
Download: Patch for WUAU update