I know 2.71 hasn’t even officially been released yet, but in 2.72, there’ll be a new distribution model for glossy shaders, Ashikhmin-Shirley, and all three models have now been made available for the anisotropy shader too. I played around a bit and came up with this little comparison:

(Best to open each of these in a new tab to compare them easier)

Anisotropic Shader

Ashikhmin-Shirley:
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