IBOOK G4 Does anyone know if they have a value?

Hi,

You can still use most of the applications that were originally installed on the iBook G4. For example, a word processing program or an application for spreadsheets has not changed that much. One thing to note though, web browsers compatible with the Mac operating systems in question do not work with today's secure web pages. These computers have a FireWire port, which can be very useful if you wish to carry out transfers from an old camcorder with FireWire (also known as IEEE 1394 or i.LINK).

https://everymac.com/systems/apple/ibook/index-ibook.html

The easiest way to find an approximate market value would be to search for your exact iBook G4 model via an online auction site. Use a sold items only filter.

Depends on what you want to do. it won't run any recent software of course, but it's kind of up to you to find a use for it.