pdftkdoesn't look like much, being a command-line utility, but it's still a pretty handy utility to have in your virtual toolbox. As its man page describes, it's a tool for manipulating PDFs. You want to combine several PDFs into one document?
pdftkis the answer. In fact, that's why I grabbed it from the repositories in the first place.
But apparently, it's more than that, as the pdftk web site demonstrates.
which is really quite more than what I need for the moment.
Possibly the most useful command structure:
pdftk A=one.pdf B=two.pdf cat A1-7 B1-5 A8 output combined.pdf
which splits pages from multiple PDFs into a new document. From the example above, grab pages 1 to 7 of the first document, mix that together with pages 1 to 5 of the second document, then page 8 of the first document again, and combine that into a new document.
If you're more inclined to use a GUI front end, there's a couple listed on the web site, though none that I've really tried.