And can USB 3.0 do daisy chain? Target Disk Mode in mac? Probably not.
Why do people keep harping on about USB 3.0 like it's in some way relevant? Does the new macbook have it? Does any currently available computer have it?
People who make it their business to know about these things (Engadget for example), say that USB 3.0 will not be seen in the wild until at least 2010. Intel are also saying it'll be "up to 10x faster than USB 2.0". Well, as we should all be aware by now, USB 2.0 has never been able to live up to the 48MB/sec marketing hype it shipped with. Word is you're lucky to be able to get 25MB/sec. The (already finalised) Firewire S3200 standard will almost certainly be faster than USB 3.0. Add to this the bust data issue, and the fact that FW uses a dedicated bus, and the ongoing superiority of FW for SOME uses should not be in doubt.
Regarding the bus issue, if you're editing video or [insert data intensive media task], you really won't want your sytem being bogged down with USB 3.0's undoubtedly bulky CPU overhead, just in order to talk to your external hard drive (/attached devices). Firewire handles these things and lets the machine get on with what you're asking of it.
And let's not forget target disk mode, which has brought back countless Macs from the brink. USB can't do this. I've read it's not compatible with the design of USB, but even if it were, do we really think that it would be in any way a priority for Intel to enable this very useful, but Mac only technology in their new standard? Seems a little far fetched somehow. And for those who don't know/care what TGM is - it's what your Mac-savvy buddy will use to put your machine right or rescue your precious data, when everything goes wrong.
Bottom line - Save Firewire! The Mac platform will be very much the poorer without it.