I was fortunate enough to get invites to both Google Voice and Google Wave this week, but for now I’m going to stick with discussing Google Voice. This is mostly because nobody I know has Google Wave yet and, for a product that’s about collaboration with other people, it makes it hard to form an educated opinion about its usefulness.

Google Voice is a new service from Google which lets you link multiple phone numbers (home phone, work phone, mobile, etc.) to one new number of your choosing, as long as it’s available.  You can search for numbers via keyword (for example your name), area code or zip code.  Once you’ve chosen your new number all you have to do is link your pre-existing numbers to that one and you’ll have access to the host of cool features that Google Voice provides.

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The most obvious feature Google Voice provides is call forwarding.  Using the site’s settings you can set Google Voice to forward calls and messages to one of your various phones automatically.  For example, you could set your work phone to only receive Google Voice calls between 9 and 5 on weekdays, or your home phone to only receive calls on weekends.  You can even setup and manage certain groups of contacts and set the default phone for each – for example, if you want to direct work calls to your mobile phone you can do that.

The next feature I like is getting Google into some hot water with carriers – free SMS messaging.  From the Google Voice website you can send text messages to any phone, for free.  Many people have presumed that this feature alone is why the Google Voice application was denied from Apple’s App Store.  You can be sure that AT&T wasn’t too excited about the idea.

One of the best features you get with Google Voice is the purest form of free visual voicemail I’ve ever seen.  Voicemails sent to your Google Voice account are automatically transcribed to text and forwarded to the Google Voice website where you have an inbox for all incoming messages.  The transcriptions are surprisingly accurate, but you can also playback the message from the website if there are a few missed words.  As you would expect, from your Google Voice inbox you can read incoming messages as though you were reading email from your Gmail inbox.  You can search for messages, leave notes to yourself and even add stars to important messages so you can come back to them later.

All said I think Google Voice is an excellent service.  I can only hope that someone at Apple or AT&T decides to let the application through to the App Store.  If not, you can bet that Google will work on a mobile web version of Google Voice like they’ve done with most of their other services, and we’ll get access to it anyways.