SpinVox, a United Kingdom-based voice-to-text specialist that in October introduced support for "microblogging" networks such as Twitter, Jaiku, and Pownce, has launched a plug-in for BlackBerry handsets.
Called SpinVox Voicemail, the service identifies the caller and converts the voice message into text or e-mail or both. (The message remains audible.)
SpinVox users then have the option to reply by e-mail, voice, or SMS text message. The monthly cost of the service is based on the number of voice-to-text conversions used: there's a 10-conversion package available for about $6, a 20-conversion package for about $10, and a 50-conversion one for about $20.