Here are the commands you can issue with Voice Actions, along with how to use them:
Send text to [recipient] [message]. Composes a text message to the recipient with the message that you dictate.
Send email to [recipient] [subject] [message]. Composes an email message to the recipient with the subject and message that you dictate.
Navigate to [address/city/business name]. Launches the Droid 2 Navigation app to guide you with turn-by-turn directions to an address, city, or even a specific business.
Call [contact name] [phone type/phone number]. Calls the contact. If the contact has more than one phone number, say the type of phone number to call—for example, home, work, or mobile. Alternatively, you can dictate a phone number, and the Droid 2 will call that number.
Map of [address] [city]. Launches Google Maps and opens it to the address or city you named.
Directions to [address] [city]. Launches Google Maps and shows directions for how to get to the address or city you named. If the Droid 2 knows your location, it uses that as the starting point. If it doesn’t know your location, you must type it when Google Maps launches.
Listen to [artist/song/album]. Don’t expect this to launch the Music app and play music—that’s not what it does. Instead, it works in concert with a radio app, similar to Pandora, which you can download from the Market. When you speak the instruction, it plays the radio station that you’ve already created for the artist, song, or album. If you haven’t created one, it creates it for you.
Call [business name] [location]. Calls the business you named. If there’s more than one location, say the location. If the Droid 2 finds more than one phone number for the business, it lists all of them. Just tap the number you want to call.
Go to [website]. Launches your browser and goes to the website you dictated. Often, rather than going straight to the website, it displays a list of sites or searches that matches what you dictated. Tap the one you want to visit.
[Search term]. Simply say your search term, and the Droid 2 searches the Web using Google.
Note
If you dictate a search term that is also the name of a contact, the Droid 2 opens the contact, rather than searching the Web.
Voice Actions does a very good job of converting your speech into text when you dictate an email or text message. But it’s not perfect. So you might be leery of using Voice Actions to dictate a message, worrying that when you dictate, “I love you, too,” the message sent will be, “I move YouTube.”
Not to worry. Before you send a text message or email, you get a chance to edit the text. As explained earlier, the Droid 2 displays your message first, giving you the opportunity to edit, send, or cancel.
Voice Actions uses its own email and text messaging app, rather than the Droid 2’s usual ones. With good reason—Voice Actions knows that it might not be able to recognize every word properly, and its email and texting apps have an editing tool that takes that into account.
When the message is displayed, the app shows in blue any words that it believes it may not have understood. Tap the word, and a list of possible other matching words appears underneath. Tap any matching word to have it replace the original.
Three icons also appear—a keyboard, an X, and a microphone 
. Tap the keyboard icon, and you can type the word you want to replace the original word. Tap the microphone icon, and you can speak the word again. Tap the X to simply delete the word.
From the editing screen in the email app, you can also edit any part of the message, not just words in blue. You can add a subject, CC, and BCC recipients as well.