With IOS 5 comes the super duper charged IMessage
Lets get to the point how to use it
1.You need to add the Email address of the person to whom you want to send the imessage
2.This email address is the address with which he is associated on itunes
3.Add this to your contact
4.wait for the bubble to turn from green to blue
5.once done you can see imessage on top
You are ready to go!!! Enjoyy!!!