I get the feeling you are out of luck.
This page: http://www.info.apple.com/usen/cip/index.html
describes Apple Customer-Installable Parts and under the various iBook listings, "hard drive" is NOT one of the available choices.
I'd suggest calling your local Apple Service/Repair location. If the drive is replaceable, they would have to do it.
OTOH, you can find detailed illustrated howtos on the web, for example here:
http://uk.geocities.com/ibookupgrade/
If you know how to wield a screwdriver and have some courage, this should be possible. Advice: Print the pictures and tape the removed screws onto their images.
Disclaimer: I have done this only for older (clam-shell) iBooks. The iceBooks are even tighter packed.
-- Martin
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