Object Push Profile (OPP): This profile enables sending data (or "objects"), such as virtual business cards or contact information. Car kits that support this profile can synchronize contact lists from the paired phone.

Phone Book Access Profile (PBAP): This allows the exchange of Phone Book Objects between devices. With a cell phone and a car kit talking nicely to each other, the speakerphone can display/announce the name of the person calling you.

Bluetooth product makers continue to add features on top of the call-management capabilities you'd expect. These features have expanded recently to include handy voice prompts, text-to-speech tools, and information services.

Every time you switch on the Plantronics BackBeat 903+, for example, this stereo unit alerts you to the time you have left for playing music and calls ("listen time remaining, 6 hours"). And products such as the BlueAnt and can announce your callers by name--provided that your phone supports automatic phone book transfer--and read your e-mail and text messages back to you.