Steven Sinofsky just announced at the MVP Summit that we will build in native support for the PDF format in Office "12".

The PDF support will be built into Word, Excel, PowerPoint, Access, Publisher, OneNote, Visio, and InfoPath.

Details on the Office XML Formats blog http://blogs.msdn.com/brian_jones/archive/2005/10/01/476067.aspx

There are more details and links at Chris_Pratley's OneNote WebLog http://blogs.msdn.com/chris_pratley/archive/2005/10/01/476115.aspx