I'm really starting to love ImageMagick, I've used it to mass convert/resize family photos with scripts and all kinds of handy things.

Today I just learned that you can create PDF files with it too, say if you have images scanned or anything else it's very simple:

convert *.jpeg output.pdf

You can replace jpg with whatever format your files are in.  One thing to remember is that you can specify the order that the images/pages are added to the PDF manually.

Say if you had 5 pages and you need them in sequence you could do this:

convert Scan10002.JPG Scan10003.JPG Scan10004.JPG Scan10005.JPG Scan10006.JPG SomeFile.pdf

This is a very handy, quick and efficient way to create PDF files, now imaging the power of it if you started scripting things?