Digg.com – Synonymous with social bookmarking: you Digg a story, others Digg it, the more popular it gets the better chance it has of hitting the first page.
Blog-buzz.com – Similar to Digg, but for blog posts.
Netscape.com – A former contender in the browser wars, and the “mother” of Mozilla, it’s now a a social news aggregator with voting of stories similar to Digg.
Newsvine.com – Users can write articles on current news events, save links to external content; vote, comment and chat on article pages created by both users and by journalists.
Reddit.com – You vote up or down on a story making it move around on the home page.
Shoutwire.com – Similar to Digg, except instead of “Digging a story”, you “shout it”. Still a way to vote on unique Internet news stories.
Thoof.com – Add news stories you find interesting, anyone can “improve” the article by fixing the URL, editing the summary and more.
i89.us – Export to several formats, see popular & recent bookmarks, ability to shorten URLs.
AllMyFavorites.net – Create an organized page for your bookmarks that you can share with friends and family, access from any computer.
Backflip.com – Check out the most popular links each day, set “The Daily Routine” as your homepage so you can visit your must stop sites each day with ease.
BibSonomy.com – Public & private bookmarks, tag cloud, related tags, duplicate detection with the chance to merge their info.
BlinkPro.com – Dynamic folders, bookmark all links of a page plus all the usual features.
BlogMarks.net – Save your bookmarks, tag them with keywords for easy searching amongst your list, share with others.
Bluedot.us – Tabbed user page showing a network of friends, bookmarks, and related tags. Allows you to import contacts from all the major mail services such as GMail and Yahoo.
BmAccess.net – Bookmark a site, add tags, when you look up a tag, you get the names and a little thumbnail image of the site along with it.
BuddyMarks.com – Store your bookmarks online, share some or all of them, discover new sites to visit by searching the public bookmark area.
Chipmark.com – Browse random “chipmarks”, share them, sort, filter, and get personal recommendations.
Complore – 10MB of file storage, public & private sharing, tag cloud, popular feeds and more.
Connectbeam.com – A themed social bookmarking site for enterprise-scale business.
Connectedy – Import your bookmarks, batch edit them, check in on hot topics.
Connotea.org – A themed social bookmarking site specifically for researchers, clinicians and scientists.
Diigo.com – Highlight portions of a page, write on it like you would a piece of paper, share with your group, and search all publicly saved pages.
Excites.com – Organize your bookmarks by tags, add comments and notes, share publicly, subscribe to certain tags so you can be notified when a new site is added that may interest you.
Feedmelinks.com – All the usual social bookmarking goodies, but you can also add links via email.
GetBoo.com – Export your folders to HTML, import and remove duplicates, delete all bookmarks.
Givealink.org – Donate your bookmarks to this site to help them recommend sites and get a better understanding of how each person bookmarks.
Hyperlinkomatic.com – Import/export, categories, notes, sharing, block users, RSS, tags.
IKeepBookmarks.com – Folders, search folder names and more.
Lilisto.com – Ratings, notes, categories, smart categories and in-page editing.
Linkroll.com – Links open in new window, subscribe to tags, browse by archives.
Ma.gnolia.com – Discuss all the saved bookmarks in groups, see what the Featured Linker is all about, join discussions in the Hot Group.
Mister-Wong.com – Bookmark and tag, search for tags that interest you, make buddies with people who have interesting saved sites.
Netvouz.com – Save your bookmarks in folders, tag them with keywords, share them with others or password protect them.
Nextaris.com – Folders, tags, clippings; store up to 100MB for free.
Shadows.com – Share your already existing bookmarks, discuss and rate sites and see what you can find.
SocialBookmarking.org – User and global tag cloud, blogs, social networking, avatars and more.
StumbleUpon.com – Lets you “channel surf” the Internet and review sites; it learns what you like and recommends more of the same.
Unalog.com – A basic social bookmarking site, but with the ability to look back at specific days and see what was going on.
WireFan.com – You can vote on links as well as add thumbnails for sites.
Xilinus.com – Tags, rating, search, public & private listing, drag-and-drop sorting.
Yahoo! My Web – One button click adds your bookmarks to the search engine giants system, features duplicate detection to help you keep your bookmarks tidy.
Social Bookmarking Sites With Clipping
BlinkList.com – Save sites for later reading, share your list or keep it private, even send your saved pages to your blog for wider sharing.
Clipclip.org – Like an online scrapbook, you clip out the part of the site you want, then share it with whomever you want, and discover new places to visit.
Clipmarks.com – Allows you to clip just the chosen bits of a webpage, save them to the main website, or even insert them into your own blog. Think of it as fancy block quoting.
del.icio.us – You add your bookmarks and access them from anywhere. Check out what others are saving and see where it takes you.
Furl.net – Not only can you do the standard bookmarking and sharing, you can save archived versions of a webpage and even export all your saved pages to a ZIP file.
Linktopia.com – Keep private, share, mark as friends only, edit bookmark dates.
RawSugar.com – Can cluster your tags for you based on recommendations by other users.
Simpy.com – This social bookmarker does all the usual plus detects links that have changed, and distributes your bookmarks via your blog’s RSS if you like.
Spurl.net – You can upload your existing bookmarks to get started, add more for centralized access, check out hot lists and recommendations.
SyncOne.net – All the usual features plus the ability to add your own Google Ads to the top of your profile page.
URLex.info – Inbox, group creation, directory, all of the usual features, plus being able to send your RSS feed to the site.