Probably because of an incompatibility with the new TouchFlo interface, HTC has disabled manual switching to landscape mode on the Jade. This in itself is already a disadvantage. It is particularly bad for Opera because the very useful landscape option is now also absent from its context menu. The good news is: There is an easy way out: Just unlock the registry and change
"HKLM\System\GDI\Rotation\HideOrientationUI" from "1" to "0"
and you can rotate to your hearts delight. The respective button is now available in "Settings - Screen" - and the option is also available in Opera's context menu! Note, however, that whenever you go back to TouchFlo's today screen it will rotate back to vertical. If you want to run a program in landscape it is thus best to first start the program and then use the start button access "Settings - Screen". In Opera, however, this is not necessary.