• http://www.yelp.com/
  
  San Francisco - User Reviews and Recommendations of Top Restaurants, Shopping, Nightlife, Entertainment, Services and More at Yelp
  area bay business dentist doctor francisco friend local recommendation restaurant review salon san shopping spa store yelp
  with reviews internet by 47 users
• K-Pax
  I like the way he eats bananas -
  Bill wanders the real and online worlds and posts thoughts and links
  books bruce fiction movies poetry politics science springsteen
  with cool stuff fantasy recommended drama reviews mystery movies science fiction
• Previewseek
  Some results are pretty good - Reminds me of "gigablast" a bit, I suspect they have a pretty good crawler.  Some clusters are not relevant at all though.Site is slow -
  Previewseek Group Homepage
  artificial asia engine intelligence search services software
  with companies previewseek search engines beta by 17 users
• Search for the Ideal Social Bookmarking Service
  Rawsugar is runner up to Netvous -
  with tagging companies reviews web2.0 internet rawsugar social software search engines by 17 users

Bookmarks 1 - 4