Volumetric Fog

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Volumetric Fog
http://www.gamedev.net/reference/articles/article677.asp 

Volumetric Rendering in Realtime
http://www.gamasutra.com/view/feature/3033/volumetric_rendering_in_realtime.php 

Volumetric Fog II 
http://www.evl.uic.edu/sjames/cs525/shader.html 

Volumetric Fog

http://www.apgardner.karoo.net/gl/fog.html

Fog Polygon Volumes

http://developer.download.nvidia.com/SDK/9.5/Samples/samples.html#FogPolygonVolumes3

Crysis volFog
http://www.youtube.com/watch?v=UuTTAa4R4dA

UE3: Fog Volumes

http://udn.epicgames.com/Three/FogVolumes.html

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