I must be doing something wrong here, but for some reason in blender 2.72/2.72b the anisotropy shader is acting no different from a glossy shader.
Here is a comparison:
As you can see, there is no difference. I have tried all distributions and tangents and adjusting the rotation to no avail.
Here are my nodes:
I have not used any anisotropy since 2.72 came out and just opened up a simple scene I have not worked on for a while and noticed that none of the anisotropy is working as before.
Here is the scene I noticed it on:
The second render is the one I want.
Is anisotropy done differently in 2.72, or is this a bug? I am inclined to think this is not a bug since somebody should have reported it by now, and one of the new things in 2.72 is the new Ashikhmin-Shirley distribution.