For the longest time I couldn't figure out how to create an action in Photoshop that would align text (like a copyright tag) to the bottom right of an image. Different photo dimensions would yield different results.
Then, by some freakish accident, I figured it out.
Make your text layer and apply a drop shadow or whatever.
Select All.
Move the selection up and to the left (you can count pixels in the inspector).
Layer -> Align Layers to Selection -> Bottom.
Layer -> Align Layers to Selection -> Right.
Deselect.
That's it!
If you align the text layer to the background layer, then it's totally nailed to the corner, which I assume most people wouldn't want.
I was just thrilled that this saves nicely as an action.
Now if I can just figure out how to make actions that know how to resize based on orientation.
In addition, the Action Pack includes special filter operations that let you sort images based on various criteria including EXIF and IPTC tags, color mode, size, orientation and aspect ratio. With the Photoshop Action Pack, you can execute complex batch operations that are impossible with Photoshop's own internal Actions. In addition to filtering by file properties, you can create branching logic for more complex functionality.
I quickly Googled The Googled and haven't used this but it does sound very useful.