To continue beating this topic to death, I'd like to mention something that I haven't seen addressed in much detail yet.

The music player is one of the most obvious candidates for vertical usage in my opinion. Look at the layout of this application. The play/pause/fwd selections are at the bottom-left of the landscape screen. Considering that most people are right handed, and that the headphone jack will be plugged into the right side, it isn't very convenient or ergonomic to use with one hand. For righties, it's pretty much required to use both hands for even the simplest navigation.

Being the owner of several portable music players over the last few years, I am used to portrait navigation of albums, songs, playlists, etc. and I'd bet this is true for most consumers. Holding in one hand, flicking/selecting with your thumb just makes sense. Not to mention--how most of us are conditioned.

The media player, browser, maps, chats and ANYTHING which utilizes a 'list' format would benefit greatly from having a portrait mode.

Ultimately _not necessarily immediately_ I would love to see a platform-wide portrait option.