I'm currently reading Dr. Peter Linneman's “Real Estate Finance and Investments” and it includes some great information on how to predict population growth — the number one indicator of real estate price appreciation and rent growth.
Here are some of my notes:

The simple fact is that the best real estate opportunities are not always found in your neighborhood or local market. You may have heard the saying, “all real state is local”. Well, with over 400 markets around the United States, some markets become more favorable than others as they transition through their individual market cycles. That means that at any given time there will be markets that offer you better opportunity in terms of cash-flow and/or appreciation potential.