Web service for sending SMS

As i might have explained, i work with value added services for operators.
In a couple of weeks we complete a web service that makes it possible to send SMS.
The mainadvantage of this interface is that you can connect to your operator and all the SMS that you send from your web service client would be charged in your operator bill.
If you are interested, you could try it out : http://blog.mobispine.com/2008/10/ws-10-is-soon-here.html

It's all based on SOAP through HTTP(S) and in the first version you can send SMS.