incrediBILL - 7:40 pm on Sep 4, 2010 (gmt 0)
Later in the day I'm seeing some changes in both Yahoo and Bing.
My original assessment that they aren't the same is somewhat true, but it's starting to look more like the results are coming from different data centers that start to eventually shake out real close to each other.
One very specific search shows my post as #2 on Bing and #3 on Yahoo, and the Yahoo results have 2 results from the same source at the top while Bing only has 1 result from that source in the top 10.
Going to keep watching and see if they eventually coalesce on both services or continue to have diversified results.