As the years have gone on, commodity ETFs have continued to surge in popularity. These vehicles have allowed for investors of all kinds to add vital exposure to hard assets with ease. While there have been a number of innovative products released in the past few years, some have hit home with investors better than others. Below, we outline 10 commodity ETFs that have seen strong inflows as of 9/21/2012, to give you an idea of what is trending in the financial world [for more commodity ETF news and analysis subscribe to our free newsletter].