Files are often send around to coworkers as PDFs as the can be read everywhere. How can doing this be made easier?
Hybrid PDFs are an excellent way to make this easier: http://webmink.com/2012/05/07/making-hybrid-pdfs/
It allows you to send people attachments you can be sure they can view, but which can also be edited with free, open source software.
See also → The Magic of Editable PDFs