Today, I'm investing with CTA's - commodity Trading Advisers. Essentially, a CTA will maintain a fund, trading it according to his/her strategy in defined markets. I watch a particular CTA for 6 months before even considering investing, and if the CTA performance profile fits what I'm looking for (solid returns, low volatility, 20%> draw downs) I'll invest in one unit of the fund.
After a year, if the unit is performing in a way I expect (based upon what I've seen previously, and my investment expectations) I'll consider purchasing additional units.
As of today, I'm in two funds. One I've been with now for over 2 years, and am currently earning about 2.5% per month on my money. The second, I only recently started in March and have broken even (well, over that time frame I've made under 1% total). The fund manager claims that an account needs to be 'in' for at least 3-6 months to be fully participating in the fund strategy. Per my approach, I'll keep my money in for a year and thus will review results in March of 2013. As an aside, I monitor performance daily, updating a google docs spreadsheet.