Windows Defender has been updated with a tweaked UI (again) and marks the return of the system tray icon if you want it there all the time. Believe it or not, this was a hot topic in some circles.
http://blogs.technet.com/antimalware/archive/2006/04/13/425175.aspx
Someone on the Anti-spyware team still posts on Something Awful from time to time as 'Microsoft Spy', thankfully, that usually gives us a heads-up when a new build is coming.
