I've seen some creative uses of PDFs, Adobe's ubiquitous document tool. My favorite lately: printing out the fill-in PDF form, filling it in on a typewriter, then scanning and resending. A rather unique blend of old and new technology. This got me thinking about how important the PDF has become.
In real estate now, the PDF is used for most documentation. And our transaction forms (at least in Seattle) are all fill-in PDFs. The ability to edit and manage these forms is critical to business. Fortunately, there are many tools for this, and one isn't bound by the brutal Adobe pricing structure. I fully recommend this investment for every business.