News analysis; Keith Olbermann established himself as Current TV's star anchor, as he did at MSNBC, opening the door to a more overt liberal political ideology in its news programs; Current, which may face a lawsuit from Olbermann after his March 30 firing, faces a long slog with low ratings, while MSNBC has become better known for having progressive-oriented shows. Read more..

By BRIAN STELTER - The New York Times

Since Timothy D. Cook became chief executive last summer, Apple has taken a number of significant steps to address concerns about how its products are made. Read more..

By NICK WINGFIELD - The New York Times

Young adults are much more likely than older people to have a smartphone and to use it to look for health information, a trend being noticed by advertisers; led by auto companies and packaged goods makers, they spent $3 billion online in 2011, including $818 million for mobile ads, more than for print or radio. Read more..

By MILT FREUDENHEIM - The New York Times

With house prices still down, some large investors are creating huge portfolios by buying thousands of homes at deep discounts and then renting them out. Read more..

By MOTOKO RICH - The New York Times

Association of Magazine Media is set to announce a set of voluntary guidelines covering how magazines measure their tablet editions, vocabulary used in those definitions and time frames for when reader data will be released. Read more..

By TANZINA VEGA - The New York Times

Apple’s latest iPhones are available only in black or white, but some owners are replacing the front and back panels with colorful and unauthorized alternatives; Apple does not condone modifications and may refuse to service or repair a phone if it has been tampered with but those who do so say the trouble is worth it. Read more..

By JENNA WORTHAM - The New York Times

Stuart Elliott Advertising column presents highlights, lowlights and sidelights of the annual Transformation conference of the Four A's (formerly the American Association of Advertising Agencies). Read more..

By STUART ELLIOTT - The New York Times

Cumulus Media is giving radio stations new alternatives to Clear Channel, like a show from former Arkansas governor Mike Huckabee, making for a turbulent time in the radio business; Clear Channel, radio giant that distributes Rush Limbaugh's show at the same time of day, says it is paying close attention to Cumulus, as are the radio hosts who reach millions of listeners a day and the executives who sell shows. Read more..

By BRIAN STELTER - The New York Times