I just read the following from Ink for Word
Ink for Word is an addon to Microsoft Word that brings enhanced annotation support to Word documents. Using a Tablet PC or other writing device, you can mark up your documents by writing comments in the margins and underlining words in the body of the document. As you change the document, all of your marks move with your text.
Ink for Word also enables you to change documents with the pen. You can mark up a page with standard proof-reading marks, and the marks are instantly understood and applied to the document.
See Ink for Word in action in this video demo. The software is an early pre-alpha build.
Watch the video7.75MB 2m 8s1264x512, requires sound
Hopefully they will have something released in the near future!