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Many of the apps work in both portrait and landscape and as you can see here email looks good in landscape. Notice the icons that were on the bottom are now on the right and have auto-rotated to match the landscape orientation.
As a fan of the Zune HD, I was please to see that Microsoft provided the full Zune HD experience on the WP7 platform.
The Music & Videos app shows music just like the Zune HD, as you can see here.