Google has been in a state of flux for a while now. In many of the recent algorithm changes Google has had a pattern of bringing junk just before updates.
A couple recent searches have revealed some garbage floating to the top for me. They are obviously shifting their setpoints or algorithm again. This is one of the few occasions where I do not mind seeing my site drift down a bit. A recent Google search for "search engine marketing" placed InternetMarketingWebsites above SearchEngineWatch, which seems odd to me unless they have done some really aggressive stuff at InternetMarketingWebsites recently.