Why They’re Ugly - We know robots.txt files are boring (exceptions excluded) but does your user interface have to be too?
7. Wayback Machine
Why it Rocks - The Wayback Machine has a giant archive of website pages going back 15 years. If you want to research older links that may have disappeared or track website modifications that resulted in traffic changes, the Wayback machine lets you peer into the past, sometimes with dramatic results. It’s hard to believe this is what SEOmoz looked like just 2 years ago.
Some grey hat SEOs buy expired domains, then reconstruct the previously existing website page-by-page from the Machine’s archives. By doing so they hope to preserve the allusion of continuity to Google. (In my opinion, the jury’s still out.)
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