According to Microsoft, Service Pack 2 for Windows Vista SP1 and Windows Server 2008 RTM/SP1:

  • 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;
  • integrates the Windows Vista Feature Pack for Wireless, which contains support for Bluetooth v2.1. Bluetooth v2.1 is the most recent specification for Bluetooth wireless technology and Windows Connect Now (WCN) Wi-Fi Configuration;
  • improves performance for Wi-Fi connection after resuming from sleep mode;
  • adds new capabilities to Direct X Graphic display reliability. The graphics experience has been greatly improved for users, such as gamers, running applications that require a lot of graphics processing;
  • includes updates to the RSS feeds sidebar with improved performance and responsiveness;
  • improves audio and video performance for streaming high definition content;
  • includes ability to record data to Blu-Ray media;
  • includes Windows Search 4.0;
  • improves Windows Media Center (WMC) in Content protection for TV;
  • Hyper-V is now integrated into Windows Server 2008;
  • delivers up to 10% boosted efficiency via improved power management policy configurations;
  • improves backwards compatibility for Terminal server license keys.

Windows Vista Service Pack 2 (SP2) Beta Standalone is available for download here.