All the LED Killer currently does is kill the flashing green service LED. You have to setup your alerts to flash the LED for text messages.
Click Start->Settings->Sounds & Notifications->Notifications and choose the event "Messaging: New text message". Once you choose that, click the checkbox for "Flash light for" and pick a time limit or "no limit" to make it flash until you dismiss the notification.[/quote]
Oops, guess I would have done well to have read the above
before posting.