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this article really doesn't say much except that they have no conclusions and they don't know why. If you're going to talk about the Mac as a Java dev and exec platform, then talk about how you use it. Talk about what makes development so much easier. Is it the tools? Is it OS stability? Is it shortcuts that the Mac enables through Quicksilver? Don't go creating useless microbenchmarks that in the end don't say anything. If you're deadset on creating benchmarks, then use real-world ones like web/app server performance.
I'm going to resubmit this comment on that site as well.