Definitely. I've played with it and it's very slick. (http://www.twilio.com/sms/ http://www.twilio.com/sms/) Also, if you just want to send SMS messages to yo

Definitely. I've played with it and it's very slick. (http://www.twilio.com/sms/ http://www.twilio.com/sms/) Also, if you just want to send SMS messages to your users, you can do it the "poor man's way" by just emailing it to their SMS gateway. The downside is you need to know their provider. It's not too difficult, however, and we actually do it in one of our apps (just have fields for mobile # and provider in their profile). http://en.wikipedia.org/wiki/List_of_SMS_gateways http://en.wikipedia.org/wiki/List_of_SMS_gateways If you happen to be on Rails, there's a decent plugin too: http://github.com/brendanlim/sms-fu http://github.com/brendanlim/sms-fu