Awesome piece about Microsoft's "Save as PDF" feature (and Adobe's reaction) by Jonathan Eunice over at Illuminata Perspectives:
Adobe Systems has discovered, to its dismay, that when you publish a file format as an open standard, other companies may decide to implement tools that write to, or work with, that standard. And no matter how open or standard you want to promote your format, you may often at the same time want to exercise a proprietary prerogative over who uses that standard, and how.
A highly recommended read...