Agile Messenger – All In One Mobile Phone IM Client
http://www.agilemobile.com/

Agile Messenger is the worlds most feature rich and user friendly all-in-one MSN®, AIM®, Yahoo!®, ICQ® & GoogleTalk® instant messaging client for your mobile phone!
Send instant text, photo, voice and video messages to anyone on your MSN®, AIM®, Yahoo!®, ICQ® & GoogleTalk® contact list directly from your mobile phone or PDA! Save money on SMS: Agile Messenger sends all messages through your data-plan, there is no per message charge! This has been added to the tools section of Research Resources Subject Tracer™ Information Blog.