It has the details about PowerPC (well, Rosetta) wrong. It says "Mac OS 10.6 also marked the end of the PowerPC architecture. Only Intel-based Macs were supported from this point on."
In fact, Rosetta, and thus PowerPC applications, are supported in 10.6. That goes away in 10.7 Lion.
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Lovely illustrations and review, but it's odd not to have a single screenshot of OS X.
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