I use nimbuzz all the time, it's free and it doesn't batter my battery at all. Nimbuzz freez once it's in background, so does most of the iPhone4 apps. Skype is the one killing my battery.
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i think IM+ is very good for use instance message chatting.
I use eBuddy & like it fine. I used to use it on the Droid before switching over to iPhone.
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