Lately I have seen more and larger construction where people create conveyors with iron and other resources, showing that conveyors are becoming more and more usefull.

But this opens for the need for information about a given conveyor. Like what flows through it.
And the wifi-item, what items are actually available through it.

So I propose a new item on the edit meny (build-mode->c on the object) that shows a list of items available in it, and through it.