Pinger is a great alternative for those who don't like voice mail and prefer not to send text messages. It is also the only free service that lets you send a single voice message to a group of people at once.
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New, only somewhat intrusive service lets you blast your voice to opted-in mobile phone subscribers.
Pinger is a cool little voice service that you speak your message to, and it sends an SMS to your recipient.
CNET takes a look at Pinger, the application that handles text messaging for voice.