In Macworld Joe Kissell describes how to use the SMS Mac Scripting application to send yourself a text message from iCal.

Available for download is SMS Mac Scripting Application 2.1.

As you know, SMS Mac also supports AppleScript.
You can now define a separate email address to receive your delivery reports. Just say in AppleScript:

set report email to “john.doe@mac.com”

The report email is a property of the application object.
Secondly, you can now specify that you want to receive a [...]

SMS Mac now also supports AppleScript.

The SMS Mac Scripting application allows you to send an SMS when a specific event occurs. You can use it, for example, with iCal. You can configure iCal and SMS Mac to send yourself an SMS to remind you of an important meeting. On a Mac OS X server, you [...]