IM+ multi-protocol chat client for iPod touch and iPhone that supports push notifications for a multitude of chat protocols, including Skype and even Twitter is currently on sale for 50% off at $4.99. 
I previously reviewed IM+ alongside BeejiveIM and found it to be a good chat client for the iPhone, although the landscape keyboard has some extra space that makes the actual visible screen of messages much smaller than on BeejiveIM. But at half the cost of BeejiveIM and with Skype and Twitter push support, I think it’s now clearly the better deal.
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