In addition to forwarding your calls, it also takes voice messages that you can listen to on the Web, from a phone, or read, thanks to a new feature that transcribes voice messages and sends them as e-mail and text messages."Lifehacker's tour of Google Voice provides even more detail.
One of the ways you can keep up with emerging technologies is by visiting the Google Labs site. It is interesting to see what Google is working on. They are no longer just a search engine.