How to Easily Combine *.pdf Files

As you probably know, Mac OS X comes with a built-in *.pdf viewer, Preview.  However, as great as that program is, it has one flaw — it won’t combine multiple *.pdf files into one.  Fear not though, a free program called Combine PDFs does this just fine.  It allows you to drag and drop *.pdf files into its interface, where you can then rearrange and rotate files as necessary or desired.  I have used this program, and it performs its tasks quickly and easily — just like Mac software should!

Source:  "Merge Multiple PDF’s with Combine PDFs 2.1" by Gina Trapani, published at Lifehacker.com.