Web-based social bookmarking system. Allows multiple users to store, share and tag their favourite links online.
#bookmark
How’d I Get Here (Firefox extension)
How’d I Get Here (Firefox extension)
Track down how you came across a page in your History by back-tracking links leading up to it with this plugin.
Meshly
IM-based digg+del.icio.us bookmarking/voting system.
trailfire
Online tool for creating webpage trails and sharing them, plus sharing bookmarks.