Ever since Facebook opened up its application service to third-party developers, the site has been littered with applications; some great, some good, some bad, and some really, really bad.

Activist-turned-entrepreneur Paul Fenn's effort to bring affordable sustainable energy to California could be revolutionary -- and electricity giant PG&E isn't happy about it at all.

The social portal uses music to connect marketers with the audiences they crave.

James Andrews has become a hidden force in sports -- rescuing careers, changing the outcome of games, and making billions for stars and teams -- by mending the world's best athletes (like the 62 pros on the previous pages) and driving medical innovation.

Steve Hafner has built Kayak into the most popular Web 2.0 travel site. How it flies as the airline industry suffers.

How Microsoft and Google's battle for the stars illuminates their competing strategies for the future of tech and advertising.

How Microsoft and Google's battle for the stars illuminates their competing strategies for the future of tech and advertising.

The online world isn't always user-friendly. But it easily could be.

Can the wisdom of crowds design a next-generation car?

From this month's academic journals, four views on what makes a top-notch 21st-century leader: curiosity, charisma, neuroscience, and Ivy League thinking.