I have converted the 20" iMac G4 to an LCD which can be hooked up to any VGA or DVI computer through the base. I did this by replacing the existing LCD with one that hooks up through a standard LVDS connection and wiring it to the inverter power source and LCD controller board through the base.

I am attempting to do a similar mod to the 17" iMac G4, but to add a resistive touch screen as well. I am detailing the process at:

http://dremmeljunkie.blogspot.com/
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The iMac G4 forever changed the way I viewed computers. With some modification it can be used as an external monitor or updated all-in-one computer.