In as much detail as possible, please describe what you would like to see.

It would be nice to have a system where users submit ideas for explorations, 
and these ideas are grouped by frequency or somehow organized. Then, if someone 
wants to create a new exploration but is not sure what subject to cover, this 
could be a first point of reference.

We might also want to look into the feasibility of using search queries to 
populate this (since presumably those have some connection to what people want 
to learn).