Nimbuzz is a VOIP and messaging service based startup. Recently they rolled an iPhone app. The beauty of the app is that it allows IM and callout functionality. The IM allows to sign in for multile IM Clients like GTalk, Yahoo, MSN , Skype and many more. I started using the iphone app recently and really liked the ability to use multiple IM Clients.
They also provide domestic and international calling by providing Nimbuzzout service. But I found the International call rates to be much higher than calling service providers.
There is a detailed coverage about the company here.
The best I liked about the service is to use Google Talk, and Skype on the iPhone in a very easy way.

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