Core News Alert: Ask HN: Is there a search engine which excludes the world's biggest websites?

Ask HN: Is there a search engine which excludes the world's biggest websites?
410 by cJ0th | 165 comments on Hacker News.
Discovering unknown paths of the web seems almost impossible with google et al.. Are there any earch engines which exclude or at least penalize results from, say, top 500 websites?