
We know that Apple last year rejected the request for Google to include Google Voice as a native application for iPhone, justifying it doubled the functionalities of the iPhone, a move that Google scored unfairly.
But as you did with Latitude, Google has finally managed to avoid the AppStore and bring your voice to the iPhone software (and also webOS) through a web application based on HTML5 .

So we will have access only from m.google.com / voice to access all features of
Google Voice web simply through our Google account.
Google Voice on your mobile web version will allow us to save contacts, write messages
SMS , check the inbox, and even listen to voice messages and expected to be active throughout the day.
We will be attentive to the launch to tell you more about the application.
Via | Engadget
More Information | Google Voice Mobile

Why don't you make one?