This is a list of all the sites I'm currently looking at. They all use tagging in some way.

• Browsr: a directory of sites and services all tagged by users
  
• Looklater : del.icio.us knockoff
  
• Gather : articles written and tagged by users on various topics
  
• Wayfaring : tags maps of major cities
  
• Dinnerbuzz : tags for restaraunts and bars
  
• Oishii : tells you the latest tags on del.icio.us
• Lookmarks : search and share bookmarks
• Tagalag : tag people on maps
• AllYourWords : uses one tag for everywebsite. be the first to tag a website you like.
• StumbleUpon : rate and tag sites you like
• Rollyo : personal search engines. authority through celebrity
• Outfoxed : rely on sites that your friends tag and reccomend
• Wink : a search engine that searches tags from top tagging sites
• Digg : web articles (mostly tech) suggested by readers and tagged.
  
• RawSugar : tagges shared sites
• Supr.c.ilio.us : tagging tagging sites. so meta it hurts
• Connotea : linking and taggin academic resources
• Listal : tag and organize your DVD, CD, game and book collections with others.
• Spurl : social bookmarking and search engine
• Tagomatic : items tagged by what they're similar to
• CiteULike : a site to tag academic resources
• Blinklist : social bookmarking and search engine
• Shadows : tag and blog about sites. search engine
• Del.icio.us : the original and the best
• Hanzo : archiving the web through tags and saved pages