man, I gotta say the HDR effects in Lost Coast didn't really blow me away like I was hoping.  For all the work the Valve guys put into the implementation I came away feeling underwhelmed.  It looked nice, no doubt about it, but I don't feel like the visuals were worth the huge performance hit.  
Far Cry has a much more spectacular HDR implementation.  I'm really looking forward to the new Crytek game.
-Ace-