3Jam allows you to send reply-all text messages to a group of your friends.
New text-messaging service.
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
TellMe is a dead-simple 411 service.
Mundu Radio is a service that lets you listen to radio stations on your mobile phone.
SoonR can access a file on your home or work computer while you're out of the office.
1-800-GOOG-411 was introduced earlier this year as a way to access Google search results on your mobile phone.
Yahoo's OneSearch is a quick search tool for mobile devices.