Google anounced via their blog early this morning that users can now send and receive SMS messages to via email. For example, you are sending a text message via your Google number to a friend. In your settings, you can route the SMS messages to instead go to your email and then reply from there. This is completely free and does not count against your text messages with your carrier.
One of the benefits of this is keeping your history of the conversation in your email. While it will still exist in the Google SMS logs, you will also have it on your Gmail history in one conversation.
You can still send SMS messages via Google Voice page, but if you dont turn off the notifications, it will come to you via text. Thus being charged for the replies. Routing to your email is free. Really if you think about it, its no different than many of the apps that are already on the iPhone, Text Plus being one. The cool thing is this is fully integrated and there is no set up. Other than that of the clicking a check box.
That web app cant come soon enough. Unless FCC drops the hammer on Apple and finally approves the GV mobile app!