Hey everybody,
Thanks for all the responses. Apparently landscape is not very well supported in WP7, which is very surprising to me since most of the interfaces are fairly simple.
Some other things I noticed is that the keyboard is the same way. For example the keyboard can't be used to scroll in the web browser (like I could on my TP2). I am not particularly fond of gestures when things can be done without waving your hand all over the place. Also, in the WP7 menus, you can't jump between fields using the arrow keys.
I'm hoping that the mango update fixes some of these, but I am doubtful since their focus doesn't seem to be keyboarded phones, and also since I haven't heard anything official about anything to do with landscape mode... ever
