My mind is inclined to think that with the activity between ICE and the NYSE you're going to see either an uptick, or an outright explosion of developers writing software for trading commodities. Foreign Exchange trading is still the reigning king of developer friendly trading environments because of the nearly limitless platforms and systems for traders; stocks and commodities will soon join them (though there are already highly technical systems in place).
This last bit is based on second-hand experience: Forex traders pay good money for data in the form of dashboards and widgets. You don't have to write anything that allows the trader to actually make trades/open/close positions, but a personal friend took a few days off from his sys admin job to write a dashboard for the EUR/USD pair with technical analysis that can be published with one line of javascript.
It was licensed to a private client within a week for demoing purposes. He quit his job a few days after that and had sold 8 more licenses.
Great thread, actually. I'm curious myself, now that I chew on the question a bit.