I'm seeing some of my keywords slip further. Why? Because of even-worse "host crowding" (clusters) of Amazon results. I'm talking about some long-ish tail keywords here. First page is 100% (without exception) taken up by both Amazon and eBay results - normally 6 or 7 Amazon, 3 or 4 eBay - for most of these keywords. If Matt Cutts was true to his word and Google are working on the host crowding problem, why is this happening? These SERPs are resembling a Custom Search Engine for Amazon and eBay.