Just installed Screen Spanning Doctor on my iBook. What this does is to enable the use of the iBook screen as well as an external monitor/LCD as a seperate display!
What's more, I can now set the external display resolution to the full screen resolution. Meaning my iBook can remain at 1024x768 while my 19 inch Viewsonic LCD can be at its 1280x1024! Since my LCD can select between analog input (VGA port) or digital (DVI), I can share it with my windows PC.
Anyway, what Screen Spanning Doctor does is to enable the graphics card and OS X's ability to support 2 monitors. On an iBook this has been disabled. Probably to encourage customers to "upgrade" to a better Apple product.
One of the best free downloads ever.