How can Motion Blur be enabled?

[MirceaKitsune]

I'm not seeing Motion Blur marked as 'experimental', yet it never works when turned on and turns itself back off when the game is restarted. I know it's probably not ready, but I'm seeing pictures such as http://vdrift.net/Gallery/media.php?f=0&...9012202391 and http://vdrift.net/Gallery/media.php?f=0&...9012200738 where it does work (from 2007 even).

I was wondering if there's any place to get the correct shaders from, or what must be done to enable what currently works of motion blur? Windows 7 64bit user and my video card is an ATI Radeon HD 3870 X2.