Hopefully this means we can standardize data exchange on something like Ethernet so that if some faster technology is invented on the physical layer, it would be easy to upgrade. This scenario is what Bonjour is made for. Imagine plugging in any peripheral into any port. The peripheral would automatically assign itself an IP address with zeroconf, assign itself a name with mDNS, and advertise its capabilities through services discovery, all without requiring a DHCP server or DNS server. The backside of your computer would be one power port and a whole bunch of Light Peak ports. No more fudging around with USB, FireWire, BlueTooth, DisplayPort, DVI, VGA, all of which are incompatible with each other but do the same task of moving data around.
Here's an excellent (but long) video on this topic: http://video.google.com/videoplay?docid=-7398680103951126462