3Jam allows you to send reply-all text messages to a group of your friends.
A Nexus 7 with 3G connectivity would make sense, expanding the reach of Google's tablet beyond Wi-Fi hotspots.
Record in four places at once with Tjoon.
New text-messaging service.
Programmers from around the world will gather at the company's headquarters in Mountain View, Calif., to compete for the global Code Jam finals.
SMS for one, or all
For those looking to get rid of mobile-phone trees and send one voice message to a large group of people, Tatango Voice may be a good place to start.
Radio Handi: a good telephony toolkit