I feel stupid, is this currently available? It seems yes, some people say they've made one, but I can't seem to find either a "Categories" or "Collections" option. Sorry, I don't know which area is called the "user panel", but I've looked at the tabs across the top, and in all the menus (+, channels, profile).
I did see the collections tab on the Magazines page though, and I see Random Collections in the right side panel, just can't find where to create my own category/collection.