Sooo, anyone know how to use this iMessage?

Does anyone know how to use this iMessage? I chose a friend who has an iPhone and I chose his email and his phone number, but the SEND button is shaded and not clickable. I thought this whole iMessage thing was universal on all our devices? I am guessing he didn't update his iPhone to iOS 5 yet. I have no idea. Not even sure how to use it. My girlfriend in Thailand has an iPhone and once she updates to iOS 5 is Apple basically saying that I can text message her free? iPhone to iPhone? Using iMessage? Are they using similar technology like TextNow or TextFree or something? Just a few ponderings. Thanks for any input y'all can give.

If you have the iPhone with iOS 5 on it and you setup iMessage with it and then start using it, then (Your cell number) is automatically registered with iMessage. (Remember Apple at this stage do not have telephone numbers registered but only e-mails. You can then use your cell number and vice versa with your friend on iPhone and iPad.
If you only have the iPad and not the iPhone and someone else you know that only owns the iPad and not iPhone with iOS 5, then you would only use the e-mail to send via iMessage
When you send a message on the iPhone, the SMS 'send button' is green. If it's an iMessge, the 'send button' is blue.

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