Useful Links

Bookmax.net is a free online bookmarks manager:
http://www.bookmax.net

Diigo is a web highlighter and sticky notes: 
http://www.diigo.com

DubbaGol is an open source content management system (CMS) that lets you easily create your own social network:
http://www.dubbagol.com

MyLinkVault is a free online favorites manager:
http://www.mylinkvault.com

Spotback is a personalized rating system that recommends relevant content based on personal rating history:
http://www.spotback.com

Ziki is a social bookmarking service that allows you to submit an article that will be promoted based on popularity and discover content from anywhere on the web:
http://www.ziki.com.au

Online social bookmarking is a quality social bookmark online network where you can share information with other people and users:
http://onlinesocialbookmarking.com

Savethislink.net is a dofollow social bookmarking site:
http://www.savethislink.net

BookmarkDoFollow.com allows you to save your bookmarks online and share your favorite web links:
http://www.bookmarkdofollow.com

Sticktothis.com is a social bookmarking site where registered users can share submit story for free:
http://sticktothis.com