I can't share this in the Printing Resource Center area because I still don't have access to post, so here goes.Drop some PDF or picture files on the application or the main window. Reorder or remove pages as you want. Enter some meta information like the Title and save the new PDF.
Monkeybread's Combine PDFs demo can be downloaded from here
At the time of writing the version number is up to 5.2
It can be serialized with the number from any of these links