The target user is the busy worker who wants to do more with their BlackBerry than simply read and respond to corporate e-mail. In addition to a preinstalled Facebook application, the 3.8-ounce Curve 8520 provides competent video and music players; it also makes sharing photos and video clips with social networking sites easy.

What's missing, however, is 3G high-speed data support. This quad-band GSM phone (850/900/1800/1900MHz), offered by T-Mobile, hooks into that carrier's EDGE data network, which is adequate for messaging but slow for Web surfing--even with the unit's snappy Web2go browser.

Unlike other BlackBerry Curve devices, the has three dedicated media buttons for controlling audio and video playback. Pressing the Play/Pause button zips you to the Media menu, where you can activate the music or video players, change your ringtone, scroll through pictures, or record a voice note. This button also serves as a ringer mute key, a handy feature.

Veteran BlackBerry users will have no problem with the responsive QWERTY keypad and its special-function keys. Notably absent is the familiar trackball, replaced in the Curve 8520 with a tiny, touch-sensitive optical trackpad. The trackpad, which requires a very light brush of a fingertip, proved both accurate and easy to control after a few minutes of practice. A firm push produces the equivalent of a mouse click. Flanking the trackpad are the standard Send and End keys, as well as the Escape and Menu keys.

The Curve 8520 is edged in rubber, which provides a comfortable gripping surface and protects the unit from minor bumps. The design also insulates the volume-control keys and the camera button on the right side, and the voice-dial button on the left, from the weather. The 8520 has a standard headset jack and a microUSB port for a data cable or charger. According to RIM, the Curve 8520 offers 4.5 hours of talk time and up to 17 days of standby time on each charge of its lithium ion battery.