According to Google's Matt Cutts, a new search algorithm is going live as we speak that will be the first step in combating the spam search results problem. This change to the algorithm specifically targets sites that copy or scrape content from other sites, and amp it up with Google-friendly SEO. Now users should be more likely to see results from the site that a piece of content originates on, instead of a spam site that just copied it.
This change will only directly affect about 2% of searches, and only 0.5% will change dramatically enough for most people to notice. Clearly, this is not meant to completely solve the issue of highly efficient SEO spam. But it is a solid first step, and we're happy to see it get rolled out so quickly. More algorithm changes should come along in the future as well.