Sending an SMS message via one click? Can I send an SMS message via one click or touch?

Can I have an icon or shortcut that would let me send an SMS message to a certain phone number with predefined text?
The Tasker app will let you do this (and much much more)

Once installed, add a "Task" widget to your homescreen, and have it run a "Send SMS" action.  This lets you specify the target of the SMS, as well as the full body of the message.