Raddrs board talks a lot about commodities, their favorite is PCRIX, which is a low cost commodity index. He's done a lot of good analysis that shows that commodities are an even better inflation hedge than TIPS and a better portfolio stabilizer than bonds. In fact, if my memory service Raddr did a portfolio of about half PCRIX and half small cap value and that provided the best returns coupled with pretty low volatility compared to other combos of stocks, bonds, tips and so forth. My stomach hurt just thinking about it though.
These funds usually use TIPS as collateral against purchasing a broad index of commodities. Commodities tend to reflect "unexpected inflation" inasmuch as when prices of commodities go up, its usually reflecting an image of real inflation at the commodity level.
The good news is that this means you get the returns from TIPS *and* the returns from the commodities.
The bad news is you probably dont want to own this sucker in a taxable account as you will absolutely get pasted by the TIPS inflation adjustment and the thrash commodity trading. Other bad news is owning these funds in a deflationary environment or inflation neutral environment isnt very rewarding either.
Temper any decisions with the knowledge that most of the historic data on commodities and TIPS is helped by the highly inflationary periods during the 70's and 80's...times that supposedly shouldnt recur now that we're supposedly better experienced at handling a non-gold based monetary system. And with the fact that everyones been piling into these investment vehicles over the past year and prices have really run up.
Some analyses show that the run up is justified, and that the prices arent overvalued.
Me, I'm not big on buying something that just ran up 30-40%.