Besides that, OOXML (.docx etc) still gives minor problems in LibreOffice and OpenOffice, if the document is made in MS Office 2007 (or in later MS Office versions with compatibility mode enabled). And the open source ODF (.odt etc.) still doesn't work flawlessly in the Windows World, because all MS Office versions before v. 2010 don't read it.
PDF is still the best to use file format if editing by the receiver isn't necessary, because that way the lay-out won't be screwed and everybody can open it. And let's not forget that PDF at least is an ISO standard (AFAIK).