Health Obama:
There are multiple, multiple reasons to use PDF. It's very name is Portable Document File. It is the most widely used file for attachments, transferring and documentation in the world. Everyone has an Acrobat reader and, if not, you can find one anywhere. Not everyone has a TIFF reader. You can do sooooo much more with a PDF document.
I am not sure why you would want any type of document to be saved to JPG.
Word is find, but it is too easy to edit and takes five times longer to open than a pdf. PDFs are much easier to merge, etc. It is also more difficult to change a pdf, although it can be done. And, as stated PDFs can be marked up in many, many ways.
This is only my opinion, but I wouldn't use anything other than PDF to save documents. It is, by far, the best -- again in my opinion.
And, depending on what program you use (there are many, many 3rd party apps that work with PDFs) -- I still use Adobe itself, you can do unlimited things. With TIFF and other formats you can't always choose from one click email, combine, collaborate and even upload to Share.Acrobat Online. With Adobe Extended (pricey but incredible) the documents and presentations are incredible. With Adobe Connect Now Beta, you can have online meetings that rival and are even better than WebEx.
Convinced yet? I could go on and on....
