I am sorry if this capability already exists, I looked and did not see it.
Anyway, it would be great if there was a way to easily notify people that you are sharing a workspace with of changes/updates to the workspace.
For instance, I just added some documents and wanted to easily update my students that I have added this week's deliverables and lecture to the site. Couldn't find a way to do this short of deleted all the "shared with" email addresses and resharing.
Thanks,
Karyn