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Portrait please. :)
And to think, I was so upset with the lack of landscape texting in the original iPhone... I NEVER text in landscape.
 
Landscape for web browsing, watching videos, and playing games

Portrait for emails, Facebook, Twitter, photos, and e-reading.


If I had to pick one, though -- I'd say I use landscape a lot more than I do portrait.
 
Portrait only, I actually switched off autorotate. Except for games, but they switch to landscape on their own anyway. :)
 
A lot of apps are meant for landscape mode, it feels more like an iPad when I hold it sideways instead of in portrait mode. If I don't it just feels like an enlarged iPhone lol.
 
Landscape, almost exclusively. It's the full sized keyboard. I can't touch type on the keyboard in portrait orientation, whereas I can in landscape. I've never been a fan if thumb typing.

I also prefer reading in landscape. I like the look of an open book with two pages facing me.
 
This depends on the iPad. Portrait browsing on the iPad 2 is nicer than portrait browsing on the Mini due to the type being very small on he latter.
 
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