That’s right… today Matt Cutts completely reversed his opinion on pages indexed in Google that are nothing more than copies of auto-generated snippets.
Back in March of 2007, Matt discussed search results within search results, and Google’s dislike for them:
In general, we’ve seen that users usually don’t want to see search results (or copies of websites via proxies) in their search results. Proxied copies of websites and search results that don’t add much value already fall under our quality guidelines (e.g. “Don’t create multiple pages, subdomains, or domains with substantially duplicate content.” and “Avoid “doorway” pages created just for search engines, or other “cookie cutter” approaches…”), so Google does take action to reduce the impact of those pages in our index.
But just to close the loop on the original question on that thread and clarify that Google reserves the right to reduce the impact of search results and proxied copies of web sites on users, Vanessa also had someone add a line to the quality guidelines page. The new webmaster guideline that you’ll see on that page says “Use robots.txt to prevent crawling of search results pages or other auto-generated pages that don’t add much value for users coming from search engines.” – Matt Cutts
Now, while the Google Webmaster Guidelines still specifically instruct webmasters to