"We're adding a position in one of our favorite ETFs for 2008: the PowerShares DB Agriculture Fund (NYSE: DBA), which provides investors with an alternative way to invest in the agricultural sector," says technical analyst and contrarian investor Chris Johnson.

The money manager and editor of Insightful Investor explains, "We feel a long-term position in DBA is appropriate for any investor's portfolio." Here is his review.

"One of the areas of the economy that we have been outwardly bullish on is the agricultural group. From a fundamental perspective, the 'ag play' is in full force, as demand and supply remain imbalanced. This has been a fantastic catalyst for a number of stocks that have to do with the agriculture sector, as we have heard in the news quite a bit lately.

"While we like the environment that this creates for a number of stocks, there is one agricultural investment that we do not hear trumpeted in the media as much as one might expect. We're referring to an investment in agricultural products, not the companies that help to produce the products.

For 25 years, Steven Halpern, editor of TheStockAdvisors.com, has surveyed the leading financial newsletter advisors asking for their favorite stocks for the coming year. This article is one of 100+ ideas in the Best Stocks for 2008 report.

"The commodity bull market has a long way to run, powered by explosive growth in the BRIC (Brazil, Russia, India, China) countries," says Sean Broderick, resource stocks editor for Money & Markets.

"My top conservative pick to play the broad commodities bull market is the broad-based exchange-traded PowerShares DB Commodity Index Tracking Fund (NYSE: DBC).

"As an ETF, it is like a mutual fund. However, ETFs usually have lower costs than a mutual fund and you can buy and sell an ETF throughout the day, whereas a mutual fund trades once a day.

The PowerShares DB Commodity Index Tracking Fund has a long name but a simple idea -- the fund invests in commodities: crude oil, heating oil, aluminum, gold, corn and wheat. DBC invests in that basket of commodities by purchasing futures contracts. It rebalances annually to 35% crude, 20% heating oil, and 10% to 12.5% of the other four."