Missed this at Web 2.0, so glad to see it blogged.

411sync has built an API for SMS.

Developers can create keywords (ex. mlbscores) within the 411sync service, which in turns communicates with the developer’s content via RSS XML.

Your URL could be pointing to an XML file, example: http://www.aaa.com/data.xml or it could pointing to a program, example: http://www.aaa.com/cgi-bin/test.cgi?request=. In the latter case, we will call your program and pass the body of the text message to it. For example: if the user sends an SMS with mlbscores red sox, then we will call your program http://www.aaa.com/cgi-bin/test.cgi?request=red sox.