Off the news that Yahoo! is shutting down Delicious, I’d like to suggest a good alternative: historious
historious is a search engine for your bookmarks, which means that you can search all of your bookmarked sites for any word in the pages, and not have to browse all the obscure title to remember where you had seen a particular article.
historious also archives all webpages, so you can refer to them and share them even if the original page has changed or is no longer available. You can also import your delicious bookmarks by uploading the exported bookmarks file.