Windows Phone 7 Browser Orientation Detection
A lot of traffic is coming to this page although it does not exist any more…
So I re-created it with some links that might help you find what you are looking for, instead of giving you a 404 page.
orientationchange() on windows phone browser – Stack Overflow
Managing the Windows Phone Browser Viewport – The Windows Blog
Orientation detection in your Windows Phone 7 – Maragna.net
Working with Mobile Device Orientation Detection – Code Review