The prolific Mindjet labs has produced another great integration with Office 2007, this time with OneNote 2007.  This integration allows you to

• From MindManager, you can easily map out the Notebooks, Sections, and Pages, including hyperlinks to the notebooks, sections, and pages:
  Select File...Open...OneNote 2007 Notebooks.
• From MindManager, you can send the current map to OneNote as an image that you can sketch on and annotate:
  Select File...Export...Microsoft Office OneNote 2007.
• From OneNote, you can send a page to MindManager as a hyperlinked topic:
  Press the Send to MindManager button on the Standard toolbar in OneNote.

Rob Bushway has a great post about this on GottaBeMobile.com.

You can download it here.