I have a 2008 MBP 15 and airdrop is in the finder as an option. I also have a 2007 iMac 24" alum, and airdrop is not in the finder. I've searched and cannot find it on the computer. Reading what scant documentation there is on the feature, it says that there is no configuration, setup, etc and it is a drag and drop operation, but that is assuming it is listed in your sidebar or menu options in finder. Anyone have the same issues, or know if Airdrop is not compatible with that machine?