How to merge PDFs into one file is something I have frequently been asked ever since Preview 6 made combining and saving PDFs a little more torturous than it needs to be (see here for the gory details). There are also various little apps that you can buy that will do this for you, but this is the kind of functionality I was talking about here that you can easily do for yourself with a bit of AppleScript magic.
Paste the copied code into the AppleScript Editor, hit ‘Compile’ in the toolbar (or press ‘Command-K’) and save as either a .scrpt file or .app as I described in getting to grips with AppleScript.
Click on the script or app and enjoy merging those files to your hearts content (and for free)! 🙂
Featured picture: sliver by *ether