Natural Clouds in your HDR Landscapes from Mike Olbinski on Vimeo.
Screencast: Natural Clouds in your HDR Landscapes
A 30-minute screencast by Mike Olbinski on some processing techniques to get natural looking clouds in your HDR using Photomatix, Photoshop and Phototools.
Not the best screencast, technically. Content-wise not bad.
Watch on Vimeo for a bigger version.