Here is another vote for PPC. I have an iBook G4 and before I installed the application I would have sworn that all it said was that you should have at least an iBook G4/G5 and OS X 10.5 at least. Then that dreaded "architecture" response. Plus, had I not been checking some spam related to something else, I would not have found that "Action Required" email also in the spam. Might remind people to add boxee.tv to their Friends!