By Olga Kharif

Devices to Transform Your iPhone, BlackBerry, or Other Smartphone

Smartphones are versatile already, what with their ability to surf the Web, deliver office e-mails, and snap photos and videos. They're rendered even more useful by the thousands of downloadable tools and games available through online app stores. But just in case you need more uses for that all-purpose calling and e-mailing device, there's a growing bevy of accessories to help out.

Devices let users project stored photos and videos onto walls and other surfaces, while docks turn smartphones into digital photo frames. This Bloomberg BusinessWeek slide show showcases the latest and greatest accessories for the iPhone, Motorola Droid, Palm Pre, and other smartphones.