My Presentation on Windows 2008 Security
Windows 2008 has a lot new security features like CNG, RODC, ASLR, Windows Auditing, Windows Defender, Security Center, Service Hardening, Bitlocker, NAP, UAC.
If you are interested on learning more about them and what is different from Windows 2003\XP to Windows 2008\Vista you are welcome to check a session I gave at Microsoft Israel.