In the business world, we frequently have a need to create PDF documents which can then be emailed around (for example, contracts and proposals). The alternative would be to use an old-fashioned fax machine; something most average users do not want to keep up with. However, many scanning programs do not make it easy to save a multi-page PDF document, instead forcing you to deal with several JPG files or something similar.
I would like to introduce to you my favorite method of scanning to PDF: "NAPS", which stands for "Not Another PDF Scanner." It's free, simple, and works with every scanner I've found. Once you scan your pages, you can easily reorder them if you like, and then save the collection of pages to PDF (or directly email if your workstation is set up with an email client).