MG Siegler:
>And again, while this may be iOS-only, guess who else is going to have to match this feature now? Android. SMS is about to become a cross-platform messaging platform only.

I hadn’t thought about that, iMessage will have a big impact in the mobile world. Especially because, as Siegler notes, it is built into the current SMS app and defaults to iMessage with SMS being a backup only (or so I hear).