I know too many people talk about Windows Vista security. Many security researchers and security professionals still talking about security innovations and features in Windows Vista such as User Account Protection, BitLocker Drive Encryption and EFS, Windows Defender, Windows Firewall, Windows Security Center, Internet Explorer 7, and much more.
You can read about Windows Vista research by Symantec Security Response in order to provide a balanced and objective analysis of these improvements. You can read pdf paper about Security Implication of Windows Vista and blog about Vista Security.
You also can read slide presentation about Windows Vista Security Explained presented by Paul Thurrott, News Editor from Windows IT Pro Magazines.