FreeSMS

Using a web browser to send an SMS message can be a time consuming process, particularly if you want to send the same message or templated message to several different people. Now you can use FreeSMS to automate this process from your Windows desktop. FreeSMS can also be easily extended to work with new sites by means of plug-in modules which can be downloaded from the FreeSMS website.
Heres an outline of some of the main features:
Multiple SMS providers are available (including free websites, or more reliable pay-per-message services).
Integration with Windows Address Book facility. Any contacts with a mobile phone number that you have stored in your .WAB will automatically be displayed in FreeSMS.
Connect to any contacts database using OLEDB, or read contact information from a .CSV file.
Messages can be sent to any number of recipients.
User defined message templates allow you to send a customised message to each recipient.