I send out mass text messages.

AIM lets you send text messages to any phone by adding +1 to any the number. So to send a text to (555) 555 5555, you would add +15555555555 to your buddy list and simply IM it.

This in addition Trillian's ability to send mass messages on AIM lets you have a free mass texting system from your computer. I made an AIM account just for the ultimate team.