I recently told everybody that i planned on writing a page on the CentOS wiki about the features supported/non supported on the Intel-based iMac .. i've just created a draft page, but if someone is interested, feel free to add comments/experiences .. I'll update the wiki page as often as time permits, for example when i'll have the RPM ready to go for the isight-firmware-tools package that is needed to load the firmware in the iSight webcam ... (the goal is of course to provide the rpm through RPMforge).