Create a booklet using preview

Create Booklet adds an export command that converts documents into PDF format for printing as a booklet with staples down the middle. This means the pages have to be resorted before printing and two pages have to be shrunk onto one. Create Booklet does that for you and as it is a PDF Service you can do it directly from the print panel. Additionally you get the Automator Action that is used in that PDF Service.

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http://thekeptpromise.com/Packages/CreateBooklet.dmg