Since the credit crunch and the unprecedented decline in the value of 401(k) accounts, US investors have been searching for answers. Not only have markets been tumultuous, but new regulatory frameworks have been introduced and fresh concerns voiced about hidden fees. Despite the severe economic retreat in 2008-9, one thing hasn't changed: 401(k) accounts - because of their tax benefits - are still the best way for most people to invest for retirement. Mary Rowland breaks down how they work, why they're still a smart investment, how to keep an eye out for hidden fees, and now is the right time to start reinvesting for your retirement. As a former personal finance columnist for the "Sunday New York Times" and the author of three books on investing, Mary Rowland has extensive experience covering the issues faced by 401(k) investors as they consider how best to prepare for retirement.