For those of you who don’t know what Voice Actions are, they are a series of spoken commands that let you control your phone and perform many functions using nothing but your voice. It is a download that replaces your current Voice Search app and brings many new and more comprehensive functions to your search button. It is accessed the same way the old Voice Search was accessed, from the Search widget or by pressing the search button and holding for a couple seconds. You can send a text message directly from your search button by simply speaking “Send text to [name][body of text]”. You can also use it to navigate to your destination by saying “Navigate to [destination]”. It can be used to send emails by saying “Send email to [name][body of email]”. You can use it to make calls, play music through many different apps including Pandora, go directly to websites, perform Google searches, and more. The best part about it is that it actually works. When you use it for the first time, a help window pops up that explains all the different functions that Voice Actions brings to your phone, and even has a link to a video to help you even further.
One of the features that I really like about it is that you can create new Pandora Stations on the fly simply by speaking “Listen to [band name]” and then selecting Pandora from the list of available music apps.
It is a free download from the market and is only available to devices running Android 2.2.
Source: Voice Actions for Froyo! - Sprint Android Forum