I have recently got an Extreme IV card with a FW 800 reader and found it to be extremely fast. But an even faster transfer occurs with the Delkin Express Card 34 reader.
Which will fit into a MacBook Pro (15 and 17")
Since the FW 800 reader is an external FireWire device, it naturally has to be on the outside.
ExpressCard/34 is a standard replacing PC-Card (AKA PCMCIA, People Cannot Memorize Computer Industry Acronyms), so the Delkin will fit into the ExpressCard/34 slot on a new MacBook Pro. I'm not sure about compatibility, but check Delkin's web pages.