A Listing Of Tagging & Social Bookmark Services

A running list of sites related to tagging and social bookmarking:

Site	Description	Comments
Blinklist	Social bookmark service	Add support for private links, watchlists and plans to add spaces for groups.
Connotea	Social bookmark service, personal library	Organize references and bookmarks for researchers and clinicians. Open source, can be downloaded.
CiteULike	Social bookmark service, automatically extracts citation information.	Targeted at academics to help store and organize papers, sites and other information. Plug-in capability exists.
Del.icio.us	Social bookmark service	Generally credited with sparking interest in this space.
De.lirio.us	Social bookmark service and enterprise tagging tool	Downloadable for intranet use.
Digg	“Digg is a technology news website that combines social bookmarking, blogging, RSS, and non-hierarchical editorial control. “	Social bookmarking is only one aspect of this hybrid site and service.
Flickr	Photo management and sharing	Generally credited with sparking interest in this space.
Flipper	“FlipSkipper is a "river-of-news" style RSS feed aggregator. Unlike other aggregators, FlipSkipper doesn't use folders to classify individual feeds, but instead uses tags that display many feeds!”	An example of applying tags to categorize news feeds. The tag is the channel with multiple feeds merged together based on that tag relationship.
Freetag	Tagging plug-in.	Open source tagging module for PHP/My SQL applications.
Furl	Social bookmark service	Actually saves a copy of what is bookmarked (personal archive).
Jamendo	Artists distribute music under a creative commons license that enables members to download, remix and share music.	An example of tags being used to determine popularity and order music. Tags help build community in addition to discovery and navigation,
Jeteye	More of an online scrapbook service that supports bookmark and tag concepts.	Enables users to create a “jetpak” (a bundle of links and notes). Tags are used to categorize jetpaks.
Jots	Social bookmark service	Supports sharing of links at a private, group and public level.
Linkroll	Social bookmark service	Modeled after del.icio.us
Ma.gnolia	Social bookmark service	Modeled after del.icio.us supporting concepts of bookmarks, tags, and groups (communities around bookmarks).
My Web 2.0 by Yahoo!	Social bookmark service	Associated with Yahoo 360°
NetInfo	Enterprise tagging tool	Team bookmarking for the enterprise
Netvouz	Social bookmark service	Modeled after del.icio.us
OpenDocs	Enterprise tagging tool	For intranet use
Oyax	Social bookmark service	Modeled after del.icio.us
RawSugar	Emphasizes a directory structure and topical navigation framework on top of tagging and bookmarking.	Good compare and contrast with del.icio.us.
Scuttle	Social bookmark service	Open source effort that enables intranet use
Simpy	Social bookmark service	Advantages over del.icio.us.
Shadows	Social bookmark service	Park of Pluck, a social media company.
Spurl	Social bookmark service	Modeled after del.icio.us and furl (archives personal copy)
TagFacts	Keep track of notes	Tags help organize note taking.