My 15" TiBook never recognized my Sonnet Aria Extreme PC card so I'll be sending it back. (It is possible that the card is just defective because it is supposed to be easily recognized and run on Airport software.) I should have asked this before buying: What seems to be the best choice for the cardbus slot. I don't want to invest the money in a slower more expensive original Airport card and the TiBook doesn't have USB 2.0. Thanks for any help that might be out there.