Acrobat Pro is good, but not the only tool I understand, for combining multiple PDF documents into one final PDF. Or, if you really needed to, you could also use it to rearrange the pages in a final PDF document.
You can also use it for OCR stuff. At leat in my version, 7.09, I can convert scanned documents into text documents. Haven't tried it yet, but it's under one of the menus.
I'm sure there's more, I could only think of 2 off the top of my head.
Jeff