iMessage lets you send messages to anyone on a Mac, or an iPhone, iPad, or iPod touch running iOS 5.
iMessage lets you send messages to anyone on a Mac, or an iPhone, iPad, or iPod touch running iOS 5. Messages appear on your Mac and any device you use, so you can start a conversation in one place and continue it on another device.
A simple messenger. It is free and rather comfortable to use.
It is very close to any other messengers. The point for it is its availability for all devices: PC, iPhone, etc. So you can stay in touch wherever you go.