I moved a 2008 Core 2 Duo iMac over to Freespire today. I also had replaced the HDD with an SSD. The install went perfectly well. I did notice that the installer did not include some proprietary drivers, broadcom and nvidia. I don't know what kind of license issues there may be associated with including those in an installer but it would be great to be able to install to a mac and be able to have wifi and compositing on first boot. Also after running updates the grub entry simply says "Ubuntu". All together the performance on the machine is outstanding.
EDIT: I did select to install proprietary drivers when installing from DVD. I guess this does not include these drivers needed by an offline iMac install. I did move it to a network cable and installed the drivers. But is this a possibility?
Well, that is unfortunate for sure. How about the wireless drivers? Is that a possibility to include in future releases of either Linspire or Freespire? I have not run either OS on any of the new iMacs. But hopefully can move everything over at some point. That would be so great.