Discovered Whatsapp on recommendation of a friend - pretty cool, actually... works like IM and SMS, all the good points, minus the cost. Works beautifully as an offline messaging tool, and equally well as a chat client. Works on data connection, so very cheap when compared to sending SMSes, especially when you are roaming. And best of all, since it is tied to a cell phone, the identity of the person and the security/privacy is much tighter than with a typical chat client.
Pretty good stuff, and available on most platforms - try it out!
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