Canon printers have never really gotten along with Macs. I wish I knew that before I bought my i9900 at home and Pro9000 at work. Apparently for instance, ou can’t print over the network. Things are a little better with the Pro9000, but apparently, it is very difficult to get them to work off the USB port of an Airport Extreme. “Apple Discussions” reports that this is a big problem. The apparent solution is from http://discussions.apple.com/thread.jspa?messageID=6648645