Of particular interest, scroll down to the bottom line where it reads:
Sony is expected to offer optional hard drives for the PS3 with potential memory capacity of 80 or 120 GB. It remains to be decided whether the standard version of the PS3 will come complete with a hard drive. The operating system has also yet to be clarified. The integrated Cell processor will be able to support a variety of operating systems (such as Linux or Apple's Tiger).
I can understand Sony supporting Linux, but Mac OS (Tiger)????
While it may be true (and is likely) that the PowerPC-based Cell processor is compatible-enough with existing PowerPC G3/G4/G5 chips to make it compatible with Mac OS, it takes a lot more than a compatible CPU to make a compatible computer. And Mac OS is closed-source, so the system isn't going to be ported without Apple's say-so.
My guess is that this is Sony's marketing people not understanding what they are writing, but who knows. Maybe Apple will decide to team up with Sony to provide some kind of non-gaming system software for the PS3. I wouldn't expect it, but Apple (at least recently) seems to enjoy doing what the rest of the world doesn't expect.