The government launched several programs last year in an effort to support the ailing housing market, including the home-buyer tax credit and the Federal Reserve’s purchases of mortgage-backed securities. But while these programs were credited with keeping interest rates low and spurring sales, others, such as the Home Affordable Modification Program, have had less success. The Wall Street Journal recaps last year’s efforts here. And looks at the recently announced revamp of the Obama administration’s foreclosure-prevention efforts here.