I don't see why there's people voting "NO"...

Portrait should be included as an option and those who would like to use it, be able of doing so. Those who are already confortable with the landscape view, just keep the portrait mode disabled.

Personally, I've got used to landscape and I could live without portrait, BUT HELL YES, there are many moments when portrait could be handy (ex: when you can't hold your device with both hands and need to send a SMS, or access a website (yes, microB allows you to see AN ALREADY OPEN SITE on portrait, but if you want to type an address you have to go back to landscape)).

Portrait should be an option, YES.. (or at least have a portrait mode for the SMS with a virtual KB)