i've only just got my iBook, and it's my first ever mac, so some help would be much appreciated. atm I'm trying to import my .wma files into iTunes using a memory stick, but when i try to open the files with iTunes i get a pop-up telling me that they are blank documents, not .wma's. When i try to convert them to MP3 format, mac tells me it can't do it, but not why. it's driving me mad! any ideas?