Search Engine Leeches?
Instintively I agree with Jakob Nielsen's analysis that search engines can be leeches. I know that there are plenty of people, including John Battelle, who advocate allowing search engines to crawl every service, whether it's delicious or Craigslist, because it gives users access to more information. But at the end of the day, I have to wonder whether that unhampered crawling can destroy innovative services. I haven't done enough reporting to validate this notion, but it's something I am intereted in looking into.