A neat improvement in Revit Architecture is the ability to add fill patterns to warped surfaces and cylinders. In Revit Architecture 2008 you could not add fill patterns on these geometric forms, it would display the colour of the material but not the surface hatch pattern. If you take a look at the image below you will see what I mean; the inplace family wall and the warped roof are unable to show hatch patterns on their surfaces.
The same model migrated across in 2009 shows the same geometry but now you can use the fill pattern tools on the warped and freeform faces.
There seems no way to adjust the rotation of the pattern in the view, but you can set up a custom hatch pattern with a rotation already applied to match the surface.
If you take a look at the wall below you will see that using the modified hatch pattern with a rotation included; the pattern now runs parallel to the surface as you would expect.