Thanks everyone for your answers.
I managed to solve this problem, the solution was in the outcome of mac-parted where I saw that all of the information was in /dev/hda3:
/dev/hda3 Apple_HFS Untitled 58342902 @ 262208 ( 27.8G) HFS
/dev/hda still doesn't have a valid partition table, but I managed to mount /dev/hda3 and get the information from that
Thank you once again for your replies, if any of you are interested I've been dealing with this bloody iBook for over 6 months (I'm not kidding, you can see some of my posts here on LinuxQuestions where I'm searching for a Live CD that works for a PPC, Gentoo 2006 seemed to be the only one that worked well since Gentoo 2007 failed for some odd reason)- I just wanted to let you know that I'm so glad this is finally over.
Now that I'm rescuing the files, any ideas what Linux OS I should install on the iBook? I've always wanted to try Arch Linux, does anyone know how Arch works on PPC?