Firewire/USB2.0
Just thought I'd post a quick response, because there was a bit of misinformation here.
Regarding USB 2.0 vs Firewire: They both have plus and minuses. USB 2.0 has the highest overall bandwidth, yes. Not by much, of course, but a little. Something like 450 mbps to 480. The major differences though are more technical.
Specifically, Firewire shares it's bandwidth better in the bus. Lets say you have a Firewire Mouse. (I know they don't exist. Shut up.) It uses up maybe 4 megabits a second. Max. Anyway you also have a firewire harddrive running. It uses the rest. So, your mouse uses 4, your HDD has 446 Mbps. By contrast, USB2 uses it much less efficiently. If you have a USB 2 mouse, or even, I believe a USB 1 mouse! it will divide the bandwidth between the devices, despite the fact that one is only using 1%. This leaves your HDD with only 240 Mbps.
Additionally, to the best of my knowledge, firewire is a peer based system. So two firewire devices are even. USB 2.0 on the other hand is master/slave. This means that while firewire can be used (at least theoretically) to connect, say 2 ipods, or an stereo and speakers, or anything else, USB 2.0 CANNOT.
So it would probably be accurate to say that neither firewire nor USB 2.0 is "better". But firewire is better
That being said, "better" really doesn't mean anything. "Beta" was better than VHS. The Dreamcast was "better" than the PSX. Market forces are more complex, and often more simple, than technical superiority.
In this case I think USB 2.0 will emerge supreme. Why? Backward compatibility. To be completely honest, I have not ever used a firewire device in my computer. In actual fact, I HAVE NEVER USED A USB 1.0 DEVICE. Yes, I use a PC. My keyboard and mouse are both PS2. Actually, I used a USB mouse for about four seconds to test that my motherboard was plugged into the front panel properly and the ports were working.
This brings me to an important point. How many people, specifically in the PC world, actually would use either Firewire OR USB 2? I would hazard a guess that the percentage would be tiny. Who needs an external hard drive? Not many. Who actually HAS a digital video camera? Some, but they aren't exactly ubiquitous.
That is why I think USB 2.0 will be more common. MOBO makers can put one plug on there, and that's all that's needed. Mouse. keyboard. Video Camera. Even some speakers. Firewire is simply not necessary.
To be blunt, the only motherboards you really see with Firewire is more expensive ones that have EVERYTHING on it. Lan, Raid controllers, SATA, etc. And yes, these boards DO all have USB 2.0. In fact, I would say that by far more boards in more price ranges have USB 2.0 than have Firewire.
So in closing, a few quick things. Should Apple include USB 2.0? No. Why? There's no need. They have USB for their little stuff. Firewire for the big stuff. That covers it. Improving the overall bandwidth of Firewire to 800 is cool, though a pity it means a different plug. While you wouldn't expect old cards to go faster, being able to drop down to 400 on an older system would be a benefit.
Finally...
"Apple Wins One"? Hardly. USB 2.0 is gaining more popularity in the PC world than Firewire. It is simply more useful for more people. But who really cares? The Apple world and the PC world are different. They're allowed to play with different stuff.