That's a big improvement on OneNote sharing. 2010 is still dependent on a MAPI client. I hope they do the same thing for Word, Excel, etc. in 2013. It still would be nice however for Microsoft to merge any "sending/sharing" functionally so it's the same workflow across the desktop and Windows Store App space.
It's a super clipboard. Great start but not quite the one step approach of the share charm or "send to". BTW looking at the project's issue list it looks like they have a long way to go; doesn't support OneNote or Outlook as sources.