I heard about this through WGN Radio AM720. They are sponsoring a service by Zelephone, a mobile startup that allows youth, school, and other community groups the ability to set up phone tree groups online. It sounds like a pretty nifty service that is easy for parents and other nontechies to use. Could also be used for activism related projects too.
Disclosure: I write for chicagotechreport.com
and am interested in any nonprofit / community tech news going on in the Chicago area.