AE (Asset Exchange) is a peer-peer exchange into the software to allow for decentralized trading which eliminates trust issues and trading fees.
The same technology that will allow you to trade Nxt for almost any currency will also allow you to trade Nxt for almost any commodity.
This feature is based on the “colored coins” concept. Since the blockchain provides a trustworthy record of transactions, it can be leveraged to provide a record of traded items other than Nxt. To do this, Nxt allows the designation or “coloring” of a particular coin, which builds a bridge from the virtual crypto-currency world to the physical world. The “colored coin” can represent property, stocks/bonds, commodities, or even concepts. As a result, the Nxt network could be used to trade almost anything.