After many attempts at creating a working action to add a custom watermark to my pictures (and I tried all the tutorials, from books and online), I came up with this method, follow it through and you'll end up with an action that will always place your logo where you want in the same size (relative to image size) no matter which orientation you use.
A PDF version of the tutorial is also available
here
Your new shape layer should take form based on the style used. This is probably the best time to add text, since it makes it editable, remember that you're not limited to the 72px that it lists in the font size.
Save this document as 'copyright logo.psd' (this is photoshop's own format, it's nice for layers, transparencies and vectors)
Save the file to a location you'll remember but won't modify or accidentally delete.
Open an image, any image you want to add a watermark logo to.
You'll start with a nice, clean palette
Open your 'Ruler and Units' preferences dialog box.
Then change your ruler settings to 'percent'
Open your actions palette, and create a new action.
Name your new action something like 'Copyright Logo' give it a shortcut if you like.
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