Read this blog 

http://librarianinblack.typepad.com/librarianinblack/2007/04/webpage_white_b.html

– I can see possibilities for VCM & Marketing but others may see where they could use this feature too.

Firedoodle (which I found via eHub) is a Firefox add-on that lets you add white board functionality to any webpage, image, or map.  You can mark it up all you want with highlighting, writing, and placemarking.  You can also save your work if you create an account.  This could be used during website redesign processes--send out a page in progress and ask staff to mark it up.  Or it could be used to train on various sites, explain troubleshooting issues you're having, the uses go on and on.  I think of it as a way to do what most of us do in Paint or Photoshop with the screenshots we make--except you can do it right on the webpage in the browser instead of having to do a Print screen, open the image program, etc