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From Slashdot, who got it from ZDNet Australia:
“As to the why … Part of it is simply that I wanted to try something else, and I felt like there were enough people testing the x86 side that it certainly didn’t need me. Part of it is that I personally believe there are two main architectures out there: Power and x86-64 are what _I_ think are the two most relevant ones, and I decided that I had to at least check the other side of it out seriously if I really believed that,” said Torvalds.
So Linus uses a Mac too, but apparently, he got it for free.