Featuring always-on connectivity and the ability to send IM and picture messages via Google Talk, MSM, AIM, Yahoo, and ICQ Agile Messenger is probably one of thee best and most reliable Instant Messaging clients available on the AppStore. Agile Messenger is a good looking, very stable and reliable IM client that every iPhone user should consider buying.

Agile Messenger is the most feature rich and user friendly all-in-one MSN®, AIM®, Yahoo!®, ICQ® & GoogleTalk® instant messaging client for your mobile phone!

Features:

• Always-on connectivity keeps your IM accounts online while you use other iPhone apps.
• IM to Email forwarding to notify you of incoming IM messages.
• Voice and Picture Messaging enable you to send instant voice and picture messages to any IM contact

Agile Messenger for iPhone is $9.99 USD on the AppStore – Buy it here [iTunes Link]

- source: agilemobile.com