My goal was to turn lights on and off via cell phone text messaging. Using Bob Paauwe's iLink INSTEON software (http://www.bobsplace.com/ilinks/) as well as Twitter (http://www.twitter.com), I was able to network my cell phone with my house's electrical system. The goal is to implement this on a larger scale at the Duke University Smart Home (http://www.smarthome.duke.edu/).
Special thanks to Bob Paauwe for developing iLink and helping me with the configuration. Also, thank you to Summize for providing me with API access to Twitter.
Send any feedback or suggestions to justin.wickett [AT] duke [DOT] edu or @jwickett on Twitter
A tutorial can now be found at http://www.duke.edu/~jyw2/INSTEON.pdf