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For those that like All-in-One IM like me, this is a good one recommended by my friend. It has Skype too. Its shortcoming is the lack of video call, which I believe it in their road-map.

imo support  Skype, Facebook Chat, Google Talk, MSN, ICQ/AIM, Yahoo, Jabber, Myspace.

Chat with all your friends in one app with imo.

Android version:  https://market.android.com/details?id=com.imo.android.imoim
iPhone version:  http://itunes.apple.com/us/app/imo/id336435697?mt=8&ign-mpt=uo%3D6
iPad version:  http://itunes.apple.com/us/app/imo-instant-messenger-for/id405179691