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Actually, the entire reason I made this site was because I thought the way MacRumors visualized the data wasn't very good. If they had done a better job, I wouldn't have needed to make this.

As for credit... what should I be crediting them for? I'm just collecting a list of dates and then visualizing the data.

A simple link at the bottom saying, "inspired by macrumors.com buyers guide" would go a long way towards giving credit to the original concept. You can even even embed the url, so it's just a small font, "inspired by" to keep the page clean.

Yes. Also, the MacRumors version shows all the data, which can be really revealing. For instance, the progression of cycle length on the Mac Pro vs other products.

Am I am missing something really "ripoffy" like stealing code, images or similar data?

If yes, sure credit should be due. If no, why should they give credit?