You cannot upgrade your existing ports; the hardware for USB 2.0 is simply different. The iBook does not have any sort of PCMCIA slot or any other internal expandability other than adding new HD/RAM. So in a word, no. You're stuck with USB 1.1 until you get another computer.
No.
The ports are a part of the logicboard (mainboard) and can't be removed or exchanged.
If you need to use external harddrives/iPods/burners look into getting Firewire versions instead and maybe get a firewire hub as well so you can hook up multiple devices at once.
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