Currently, when I log into iMessage on my iPad or OS X ML, I have the ability to send iMessages from my iCloud email address. However, since I also have an iPhone, I often send my iMessages from my actually phone number (therefore, all threads on friends' iPhones etc are based around contact with my phone number). What we need for iMessage, is the ability to send messages though the same iCloud account, but with the Message ID being what I am sending from. Otherwise, at this stage, iMessage on my iPad and Macbook is pointless to me, as I don't want to be sending messages from my email address. Does anyone foresee Apple introducing this ability in the near future? I really hope it comes to see the day as I am excited to be able to message from my Mac and iPad, but at this stage it is useless to me. Cheers!