USB 2.0 - Not Yet...
This MacCentral article discusses Apple's adoption of Firewire 800 and 802.11g, and notes USB 2.0's absense:
- Apple has yet to commit to including USB 2.0 on any of its machines, but Rubinstein said the company is watching the technology. All of Apple's current CPUs are come with the slower USB 1.1 technology, which is mainly used to attach keyboards, a mouse or other peripherals to the computer.
The next revision of PowerMacs will not include USB 2.0, but rumors also indicate that Apple is still considering this technology.