I recently presented at a workshop for the Washington chapter of URISA, and went through a few tips & tricks using masks in Photoshop and Illustrator. After the conference I re-recorded the material and posted it all to Vimeo in case anyone else is interested:
Part 1: Textures vimeo.com/65877625
Part 2: Introducing Layer Masks vimeo.com/65880328
Part 3: Hillshading vimeo.com/65881830
Part 4: Masks in Illustrator vimeo.com/65883990 (this one dissects the Oyster map that I did that was in the NACIS Atlas of Design).
I really like doing the screen recording + narration videos and plan on doing loads more. If there are specific topics anyone would like me to tackle, or any general feedback on the format / length / &c. please let me know.
EDIT: Here's a link to the source files that I use in the videos if anyone wants to play along: Download Source Files