Redirecting screen output from cell phone to monitor screen

Is there any way开发者_开发技巧 to redirect cell phone output to a standard screen?

Would it be possible on Linux & X-server based devices - like Maemo? And on Android devices?

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At least N900 has video-out capability over the headphone/microphone jack, so you can plug into your TV (or anything that takes composite video) if you will. Also, you can install the package x11vnc on a maemo device to achieve this for on a computer.