PUBLIC MARKS with tags engine & tag

German blog search engine using tags

New Ajax social bookmark URL(you can see with what tags one have bookmarked you) and tag search. Says it will be adding more social bookmarking query services almost daily.

Multi-functional search engine that finds items tagged with your search term in 14 different tagging systems.

This site aggregates this data from a variety of sources. . Flickr , Smugmug , Wists , Technorati , BlogMarks , 43 Things , del.icio.us , Connotea , Furl , Upcoming.org , Jots , de.lirio.us and Consumating

Tag Search engine where everybody can tag and submit a link.(login required)

tagbert is a tag service aggregator - type in a keyword, and you will find photos, products, links, goals, and more

"Necessity is the mother of invention." As social networking has become a reality so has the need for both public and private directories. From the public or social side, users can tag their favorite sites to browsr allowing others to comment on them. These tagged sites can focus on products and services or other well-known sites and weblogs. From the private side, users create their own directories. Much like bookmarking, users add their own categories populated with their favorite sites. These private directories can be shared with select audiences. It is like having a mobile "favorites" or "bookmarks" directory. As an added feature, owners of private directories control whether other users can blog the sites they have tagged. (Note: private directories are not yet implemented in the current beta version but will be in the next version).