To use Google Voice, you must setup your account information as illustrated below.
A "Number to Ring" is one of the numbers you have configured Google Voice to ring when somebody calls you on your Google Voice number. Phone Amego will retrieve these from your Google Voice account when you press login.
Since you are using Google Voice, you probably have more than one forwarding number to ring such as your cell phone and your home phone. When placing a call, you must select which of your numbers you want Google Voice to ring. If there is more than one number, Phone Amego will add a "Number to Ring" submenu to the status bar making it easy to select the desired number without going through the Phone Amego window.
If you want to change which numbers Google Voice is configured to ring, you can press and hold Option while clicking on any "Number to Ring" from the menu. Phone Amego will open a Safari window, login to your Google Voice account, and display the "Phones" configuration page. From there you can select which phones you want to ring.
Your Google Voice password is stored in the default Keychain. If you upgrade to a new version of Phone Amego, the Keychain may ask you if you wish to allow the "new" application to access your Keychain. Phone Amego updates that are downloaded automatically are signed by the developer using a private key, so this is quite safe.
Google Voice does not support private extensions at this time. Phone Amego will remove extensions of the form "x123" before dialing.
Google Voice works best with 10-digit phone numbers that include the area code.
When you place a call using Phone Amego, your Google Voice number will appear as the caller to the person you are calling. When you do not have access to Phone Amego, you can achieve the same result by calling your Google Voice number, waiting for it to answer, pressing "2", and then dialing the number you want to call.
I programmed my GV number as speed dial 2 on my cell phone so I can press one button to call Google Voice, press 2 again, and then select a number from my phones address book I want to call. Depending on your cell phone, these details will vary.
Apple says it is still "studying" Google Voice applications for iPhone (at this time).
Your outbound caller ID will normally not include your name when using Google Voice (since the address record of your calling line is held with Google). You can add your own listing at www.whitepages.com . Other Phone Amego users as well as MSN White Pages will then be able to see your listing.