Daring Fireball's iMessage.

In Daring Fireball's article about iMessage, John Gruber says:

"It also means iPhone users with iPhone-using friends and family no longer need SMS. I’ll cancel my SMS plan as soon as this ships."

More like it means that iPad users, for the first time, can actually send other iOS users text messages! (As MacRumors suggests.)

Question is, are Mac users includable in their conversations, or will they still need a steel can and string? No word yet if iMessage will be included in iChat for OS X Lion as well, and I would be surprised if it makes an appearance there since, well, Apple hasn't mentioned it.

—tonza