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If you need to boot an iBook g4 from a memory stick, the official line is it cannot be done. Last week though, I had to do exactly that, and yes - it can but it's time consuming and not easy.
(The CD drive had stopped working and we didn't have a boot CD. We did however have an external bootable drive clone which was made with Carbon Copy Cloner)
Here's how:

1. Plug in the USB drive containing your bootable system
2. Turn on the iBook and immediately hold the keys Command Option OF. It should be in OpenFirmware mode now.
3. Let go of the key combination.
4. Type

boot ud:,\\:tbxi

It will start booting from your USB device. If it doesn't, go to step 5.
5. Type:

dev usb0

Now press return.
6. Type:


If you see "/disk@1" mentioned, carry on, otherwise go to step 5 and use "usb1" instead of usb0
7. Type

dev disk@1

Now press return, then:


Press return again. You should get something that looks like:


This info is now used in the next step.
8. Type

boot /pci@f2000000/usb1b,1/disk@1:,\\:tbxi

This is the device name shown in step 7 (after typing "pwd" with ":,\\:tbxi" added to the end).
9. Press return. It should now boot. It will be slow, but will allow you to reinstall the system.

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