Web2SMS Gateway:

I had a friend that needed a service to send SMS messages to subscribers, so I developed this proof of concept over night for them.

 This site/service allows you to send SMS text messages to cell phones from a website, web service, or even an application.

You can submit the send request via this website or via a standard web request.

Try it out:

http://web2sms.madmasterminds.com/