Post to Del.icio.us – probably the most widely used system
Save on Furl
Save on Diigo – a new system with a remarkable range of features
StumbleUpon.com
Seed This Post
Send to Digg
Add to Yahoo My Web 2.0
Add to Reddit
Ma.gnolia
Socializer – submits to a range of bookmark systems if you are a member of more than one
or add this URL:
to any other social bookmark system.
Most of these systems provide a browser plugin or special ‘bookmarklet’, enabling you to add a page directly from your browser. For instance, del.icio.us offers an excellent addition to the Firefox toolbar, giving two extra buttons.