Remember that thing I said about simulating landscape mode in the emulator? Forget about it. With the release of the Windows Phone Developer Tools Beta, I’m pretty excited to say that landscape is now natively supported by the emulator so all you have to do is set your preferred back buffer size (along with optionally specifying your supported orientations) and the framework handles the rest. No more render target landscape modes for Windows Phone developers!

Want some more details? Check out these two posts by Shawn Hargreaves:

http://blogs.msdn.com/b/shawnhar/archive/2010/07/12/resolution-and-scaling-on-windows-phone.aspx
http://blogs.msdn.com/b/shawnhar/archive/2010/07/12/orientation-and-rotation-on-windows-phone.aspx