Free Software Magazine has three articles on this topic in their latest issue. See:
Making PDFs with free software
http://www.freesoftwaremagazine.com/blogs/making_pdfs
Paper is dead - has PDF followed suit?
http://www.freesoftwaremagazine.com/...s/editorial_16
So, why has the PDF gone?
http://www.freesoftwaremagazine.com/...s_the_pdf_gone