Free Text messaging,within USA, subscription based, APIs available
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TextMarks Mobile Application Services (http://www.textmarks.com) Platform has access to powerful text messaging functionality for integration into your existing and new web and enterprise applications. TextMarks Blog serves to open up the channels of communication between TextMarks and people, to keep you informed and help you make the most of our text messaging services.
Want to let your blog readers subscribe to your blog’s RSS via SMS? Whether it’s because somebody interacted with a user on your site, because your store is having a sale, or even if you just want to let people know about a new feature or product… The ability to easily broadcast text messages to all or any subset of your users will expand the reach of your application and bring convenience and information to your users wherever they are.
The TextMarks XML-RPC API allows you to pro grammatically access TextMarks data and functionality. This enables your web or enterprise applications to utilize the TextMarks platform without going through a mobile phone or the TextMarks website, but directly from code. Some degree of web programming knowledge is required to understand and use this API.
For further reading and use the free service visit TextMarks Mobile Application Services. You can exclusively have this service for you alone or for a private group or public group of people. Users can subscribe and unsubscribe for the messages anytime.
If you have similar sites, feel free to update in comments…

Sounds like a great service and very useful one,
you should also write about the text2land new service that allow you to send sms text messages to landline phones.
Thanks Roman, I will definitely review the text2land soon.