My son is thinking of buying a combined digital I/O and A/D device so he can do some serious home recording with an iMac. One product he likes has a memory card interface identical to those that are used with digital cameras. The product is made to be used with Powerbooks that have built-in card readers, and the actual output is a card on the end of a cable. But for a few bucks he can get a card reader that goes directly into the firewire port in his iMac. The device's manufacturer doesn't know if there's any slowdown in throughput from card to firewire (firewire devices typically run at 400mbps). Any help along these lines would be appreciated.