is the only site I've found that offers cool automation plugins for photoshop. You HAVE TO try ProCanvas. It has saved my sanity many times.
Pro Canvas is a Photoshop plugin designed to enhance and replace the existing Canvas command.
While providing you with all of the standard Canvas options (in Absolute mode),
Pro Canvas also adds a powerful new Relative mode that allows you to add or subtract from each side independently and simultaneously.
Additionally, you may specify horizontal and/or vertical uniformity to add or subtract the defined amount from the width, the height, or all four sides.
Pro Canvas even has a New Size display area, allowing you to preview the canvas dimensions while you work within the dialog box
know of any others??