Hi Kim,
Thnanks for posting, great suggestion!
You'll be happy to know that right around the corner (our March release) this will be a new feature added to Analytics! More details will be shared in the upcoming release notes, but in summary:
* you will have a new top-level "Group Reports" folder for all shared reports
* there will be a new top-level "Private Folder - [username]" for each user in your instance
* Group Reports are visible by all in the tree and may be run, edited or deleted by all
* Private Reports are only visible to a single user and not viewable or editable by any other user.
* You can move existing reports from Group Reports into yoru Private Reports folder.
I look forward to sharing more details in the upcoming release.
Thanks, and keep sharing great product Ideas!
Brian Theodore
Director of Product Management, Analytics
Marketo