Often I am looking for help in making a new type of report and it's more than likely some user out there has already built it. It would be amazing if there was a place for shared reports -- where users were willing to share their reports (the bones, not the resulting data) with the general WF public.
The search would have to be very good, similar to how you would search for an idea in the Idea Exchange and it autocompletes based on what you are typing.
I could search and locate the report I'm after, copy it and customize it for my instance. Users would have to opt in to share their report with the public.