Snaptank have made an excellent high resolution alien scan freely available on their site. A great making of the scanning process can be found here. Below is an image of the scan rendered with Arnold (more here).

Here are a series of tutorials aimed at mental ray users who are using Arnold for Maya for the first time. The tutorials are based on the Hyperspace Madness production over on the Autodesk Area site. You will have to download the assets from this site before starting the tutorials. I recommend downloading the assets as they are a great learning resource to have.

Saber Jlassi has produced some excellent video tutorials about volume rendering with HtoA.

Here are some awesome metal material studies using the Standard shader in Arnold for Houdini by Jarrod Hasenjager.

A guide to understanding physically based rendering in Arnold can be found in the user guides for each plugin below:

MtoA    SItoA    HtoA    C4DtoA    KtoA

Stephen Blair (Solid Angle support) has posted some great tips on energy conservation when using the Standard shader in Arnold.

Glad it’s finally public. Keeping it a secret was exhausting.

The full story is available here and here. Fxguide also has a feature on it.

_blank | REPOSITORY has some great high quality scans of food that are available to download.

Below are some Arnold renders of their scans.

Daniel Hennies from http://uglykids.org has created a brilliant video tutorial in Arnold, rendering a photorealistic portrait in Cinema 4D with C4DtoA.

Thanks for the shout-out Arnie!

The extraordinarily talented Zeno Pelgrims has created a rather nifty camera shader for Arnold for Maya, capable of simulating optically imperfect lens effects.

Below are some examples using some bokeh images from www.dofpro.com