Claire Cain Miller

PayPal's new iPhone application promises to let you quickly divide a restaurant bill and send a friend the portion you owe just by bumping your iPhones together.

Since the great app rush began, Web companies have scurried to build mobile apps. In some cases, they have realized that their services are better suited to cellphone screens than computers.

Americans could soon be able to see a doctor without getting out of bed, in a modern-day version of the house call that takes place over the Web.

With its deal this month to buy the Web music service Lala, Apple may be pointing the way to the future of music. In this future, the digital music files on people's computers could join vinyl records, cassette tapes and CDs in the dusty vault of fading music formats.

Many local governments are figuring out how to use the Internet to make government data more accessible. The goal is to spawn useful Web sites and mobile applications — and perhaps even have people think differently about their city and its government.

Technology companies have been the most active in relying on others to innovate for them.

Not so long ago, we all lived in a world in which we decided where to meet friends before leaving the house and we hiked to the nearest payphone if...

A look at blog networks.

Twitter's unparalleled explosion in popularity has been driven by a decidedly older group.

On a computer, having to fill out a form and type in a credit card number to buy something is only mildly annoying. On a cellphone, it could make you want to skip the purchase entirely.