I just gave a useful class (at least people there thought it was) on Automating Photoshop. We touched on Actions, Scripts, Droplets, and Automation commands. I have a few notes pulled together on the topic and wanted to share them here.
• Photoshop Automation Techniques
If you want a lot more on using Photoshop for Video, be sure to check out the book Photoshop for Video from Focal Press.