Hi. I just installed the new Mandrake on my dual-usb iBook. I'm a linux newbie, but here's what I know so far to answer your questions.
1. I have not found a way to exchange files between the two partitions. My OS X drive doesn't show in Mandrake, ditto for the Linux drive in OS X.
This was dissapointing as I gave most of my hard drive space to OS X hoping I could swap files back and forth. Does anyone know a way to do this?
2. My mac now runs yaboot on booting. This is a text OS loader that will let you choose between booting linux, mac, or from CD.
3. Installation was painless. Mandrake has an older
tutorial for mac users that will walk you through how to set up your hard drive before installing. I had to boot under a different boot option because of my video card, but the majority of my hardware was detected (even my airport card) and the items that needed tweaking were easy to adjust with the GUI installer.