This is the passing of an era for some of the SEO Old guard like me. We were just talking in the office about the day Site Explorer launched. As I recall there was some skepticism at the time, but how wrong we were and how much did it change our approach towards SEO over the years?
Hat Tip to the Yahoo Site Explorer team of old. Tim Mayer and Priyank Garg for what they achieved. Jason Duke showed me a Wayback Machine link to the original launch. September 29th 2005. 1:05 PM to be precise. They even talked about Webmasterworld [web.archive.org] in their original launch.