As we all know, the game now supports trading. There are a few commodities currently in the game, but certainly nothing to keep the average player interested for any reasonable period of time.
It might be a good idea to contribute and discuss possible commodity ideas here, rather than have them lost in the great backlog of IRC.
I'll start with something pretty generic:
Name - Water
Recommended Lowest Price - 5
Recommended Highest Price - 50
Volume - 1
Description - Water (H2O) is a chemical substance essential to many lifeforms. This substance can be found naturally or generated by planetary-scale terraforming. Large convoys of water must be escorted due to the frequency of pirate attacks.