It is currently not possible to easily view what products are in what categories on the admin side. It would be nice when you are making one small change to a group of products to be able to view all products in that category instead of having 2 windows open in order to see what products are in a user category.
A simple dropdown selection list at the top of the products page to filter by category would work.
Agreed...such a minor thing, but so annoying.