ImagineFX Magazine, an outstanding magazine for those interested in the creation of SF/F art, has long offer a large selection of FREE tutorials on their website. These tutorials, which are taken from back issues of their magazine, often include PDFs, PSDs, and custom brushes.
The kind folks at ImagineFX have now added free video tutorials to the list of freebies they offer! They've only been uploading them for about 3 weeks now, but they already have a great selection of informative vids to sort through, such as:
Vinod Rams shows his thumbnail sketching process:
Dave Gibbons paints Rorschach:
Melanie Delon speed painting:
and Spacecraft design with Koshime: