The Microsoft Office 2007 interactive developer map has been available for several years, which is very handy for finding documentation on all Office 2007 products. Now Office 2010 has its own: See Microsoft Office 2010 Developer Map.
Want to find documentation for OneNote Mobile on Windows Phone 7? Just click Mobile Applications in the Developer Map, click OneNote Mobile, and it takes you to the correct documentation page. Yes, Project and Project Server are there, too.
The interactive map includes relationships of all of the Microsoft Office client applications, server applications, mobile applications, services and Office 365 applications, and related technologies, development tools, and platform components. Just what we have been waiting for.
The Learn Office Development page on MSDN is recently updated. It includes links to both of the Office Developer Maps, and also a link to the Office 2010 Developer Map poster.