It’s frustrating when you have a nicely formatted PDF document and as you read through it you realise that it’s missing a couple of pages here or there.
In 10.7 you could only add blank pages to your pdfs but now with Mountain Lion you can add much more!
When you open a PDF in Preview, you can now can add pages to the document from either your scanner, a file or even a blank page.
Here’s How
In Preview navigate to the Edit > Insert menu.

