I was playing around with Yafaray today and noticed the 2.65 version published by Megasoft78 does not have the template_list fix which changed on the 2.66 release. If you use the 2.65 AddOn in 2.66 you will find that parts of the interface are missing in the Material, Texture and Render panels.
I have patched the code and placed all the updated files in the attached ZIP file. Just unzip the files in to the yafaray/ui folder and overwrite the originals.
I think that was the only thing broken, but I am not an experienced Yafaray user so I have not tried out all of the possible panel combinations yet.
template_list is about an API change that effects all scripts as of the 2.66 release, not just Yafaray. A template_list is a list box in Blender panels that displays information. Yafaray will still work without this patch, you will just be missing access to important settings.
What templates are you referring to? The Render presets, perhaps?
I agree. After writing the Pixie exporter, I learned a lot about rendering, shading and photons maps. Coming back to Yafaray I realize, this is essentially a full-featured, free Renderman quality render system only not RIB based.