+1 for GV. What's cool is that there are libraries in many languages to allow you to use it in creative ways: * java: http://code.google.com/p/google-voice-jav

+1 for GV. What's cool is that there are libraries in many languages to allow you to use it in creative ways: * java: http://code.google.com/p/google-voice-java/ http://code.google.com/p/google-voice-java/ * C++: https://github.com/mastermind202/GoogleVoice https://github.com/mastermind202/GoogleVoice * C#: http://code.google.com/p/sharp-voice/ http://code.google.com/p/sharp-voice/ * obj-C: https://bitbucket.org/joeygibson/gvoice/wiki/Home https://bitbucket.org/joeygibson/gvoice/wiki/Home * Python: http://code.google.com/p/pygooglevoice/ http://code.google.com/p/pygooglevoice/ * PHP: http://code.google.com/p/phpgooglevoice/ http://code.google.com/p/phpgooglevoice/ * javascript (node.js): https://github.com/amper5and/node-google-voice https://github.com/amper5and/node-google-voice I dont know how many of those are still maintained. Disclaimer: I am the author of node-google-voice, which is still maintained.