I have not invested in this index...yet.  But it does look like a very good long term way to invest in commodities, and very simple too. 

Apparently, this ETF is supposed to track the Jim Rogers "RICI" index of commodities, which deliberately has a much higher weighting in agriculturals than a lot of the other indices.  

Right now, while I believe that commodities are a good long-term play, I think that since we are facing a recession they are probably not a good idea.  I could easily be proven wrong, and I am not 100% sure of my view.  But that is my gut feeling for now.  So I play wait and see, and look for new opportunties.

The reason I have been especially focused on this area, is a post by Norbert, who pointed out there are many markets that are going up a Lot these days.  There is no reason to feel trapped in the US equities markets for instance.

If anybody has other ideas on how to play commodities, I am happy to listen.