I do a lot of searching for knife/stone related stuff on the web. In the past couple of months I've noticed that google's results have shown a real decline in quality. Apparently around June google made a change in their search algorithm; the result has been termed "domain crowding" by webmasters. What happens is that the same domain will appear multiple times on the first results page. I searched for "king 800 stone" on google. 6 of the top 8 results were youtube (guess who owns youtube?). For the same search in bing, 7 of the top 8 results were different (unique) domains, with only 1 youtube.
In a search for "shigefusa knife" on google, the top 12 results had only 3 domains: zknives, japan-tool and CKXX. The top 12 on a bing search included japan-tool, zknives, epicedge, kitchenknifeforums, aframestokyo, japanwoodworker, ebay, and CKXX.
There are theories that google tweaked the algorithm to maximize ad revenues as opposed to search relevance. We'll never know, but until it changes I'm going with bing.