Currently i am investing in myself, in the sense that the little spare cash i have i am using to grow my own food, to insulate my house (further reduce bills) and basically reduce my reliance on the global economy which from what i read ain't going to 'grow' again ever - due to the three threats of peak oil, financial collapse and climate change.
Also investing in one's immediate community will get a better 'return' in terms of friendships, local sustainable businesses etc.