However, thanks to some internal Microsoft testers, SP2 (RTM) has been leaked out, and is available over at My Digital Life:
http://www.mydigitallife.info/2009/04/2 ... 600218005/
Aside from multiple security fixes, Vista SP2 includes:
• Ability to burn Blu-ray discs natively.
• Support for the Bluetooth v2.1 and Windows Connect Now (WCN) Wi-Fi protocol.
• Better Wi-Fi performance in Vista's sleep mode.
• RSS feeds in sidebar gadget improved.
• Windows Search 4 engine.
• Sidebar gadgets take less resources.
• Support for VIA Technologies 64-bit CPU.
• Support exFAT file format for flash memory.
• Boost your power management efficiency by 10 percent.
I have successfully installed Vista SP2 RTM on my main PC and HTPC, although it failed to install on my laptop for some reason.

