Since I've seen a lot of threads asking this question but there is no answer. I've tried it.
I get an iBook G4 (latest model) from my colleague. After a Leopard installation, a lot of missing features since Tiger are unlocked except one, a spanning display. Since iBook, iMac G5 use a VGA port for connecting with external monitor and by its default, it supports only mirror display. Then some guys discovered that it is a software lock not a hardware lock so they wrote a software to enable it. That software named, Screen Spanning Doctor, is a kind of outdated since there are no iBook anymore.
I give it a trial on Leopard and it works perfectly. My colleague iBook is now supporting extended desktop display.
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