The rental market, The demand is up and rents are rising. That's partly because those foreclosures have turned more than 4 million former homeowners into renters, but also because many other prospective homeowners, worried about losing their jobs or housing prices falling a lot further still, are reluctant to buy now.

As with many investments, the best time to get in is when most others are sitting on the sidelines. To figure out whether you can benefit by investing in rental property, here's what you need to know.

THE CASE FOR BUYING NOW

Many factors make this a great time to invest. Mortgage rates are at a 40-year low, and homes in many areas are ultra-cheap. Meanwhile, demand for rentals has risen in more than 500 cities, according to recent Census data. That, in turn, has enabled landlords to charge more. Hotpads.com, a real estate research firm, reports that rents nationwide jumped 11.6% in 2010, to $1,320 a month.

You'll need that rental income to tide you over until home prices bounce back; in fact, the typical investor today plans to hold for 10 years, according to a survey by the National Association of Realtors.

Read more at CNN Money.