If ever you need to use DataBinding with Run inside Wp7 pre-mango then

This is perfect!

http://stackoverflow.com/questions/5253622/databinding-textblock-runs-in-silverlight-wp7

"Sometimes Emulator will not change from portrait to landscape if keyboard is enabled to be used."

If you find the Wp7 windows phone 7 emulator stops switching landscape/portrait then:

"Sometimes Emulator will not change from portrait to landscape if keyboard is enabled to be used."

It's a known issue - hopefully gone in Mango!