Google Voice Easy SMS

a free application for Windows Mobile that allows easy text messaging (SMS) via your Google Voice account.

Features:
It’s free. Who doesn’t like free stuff?
Sends messages via the 3G data connection, meaning your outgoing SMS costs you nothing
Interfaces with your phone’s contacts list
Connects directly to Google via SSL to send your message, no man-in-the-middle servers that could potentially harvest your Google Account password
Signature support
Send to multiple recipients at once
Easy SMS will become completely open-source after I get the chance to comment some of the code, tidy up, etc.

Requirements:
Windows Mobile Smartphone (aka Windows Phone); software has been tested on versions 6, 6.1, and 6.5, but the program may work with other versions.
.NET Compact Framework 2.0
A Google Voice account
3G or WiFi connectivity
If your 3G plan charges by the kilobyte, be sure to keep track of your usage; this program uses very little bandwidth, but don’t try to blame data charges on me
You must abide by the Google Voice terms of service when using this program

Google Voice Easy SMS