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From the Apple Dev Site:
To start your application in landscape mode so that the status bar is in the appropriate position immediately, edit your Info.plist file to add the UIInterfaceOrientation key with the appropriate value (UIInterfaceOrientationLandscapeRight or UIInterfaceOrientationLandscapeLeft), as shown in Listing 2.
Listing 2: Starting your application in landscape mode
<key>UIInterfaceOrientation</key> <string>UIInterfaceOrientationLandscapeRight</string>