I read on the wiki that resources (like the ones in the Kethane and Interstellar mods) are were planned. I for one, think that this idea should be revisited, as it would really mesh well with career mode and should be a real focus in one of the coming updates. Think about it. You could get a contract from Callistic Manufacturing Corp. for x amount of a certain ore found only on the Mun. That would be a contract worth fulfilling. Or maybe Southern Kerbal Industries is going to need a shipment of x amount of a given resource every year. This would really encourage players to build bases on other planets. Anyway enough from me, what do you guys think? I also saw this is on the do not suggest list but this is kind of more a discussion of ideas on how to implement it