<p><a href="http://www.youtube.com/v/1ajrL-iORZk">http://www.youtube.com/v/1ajrL-iORZk</a></p>  

Well here is my rolling fog. The sample download has two projects, one for XNA 1.0 Refresh and the other for XNA 2.0. I got it up and running on my 360, but for some reason on there the textures got mashed, the fog was fine though. I will have to look into coding shaders for the 360 more, must be me doing something silly...

Also forgot to mention on both the other shader fog posts and this, that the models for the building were from 3DRT in the free download section.

Anyway, the download can be found here.