Had got a list but it proved to be a bit old. For example propeller has been shut down, digg is only useful if you have a long list of friends. Also what are the popular article directories for article marketing apart from ezine
Ezine articles and article base are some of the more popular article directories out there. Just google "top article directories" or something along those lines and you will find all of the best ones. Also read around this forum if you want more details about which article directories work the best, people talk all the time about their experiences with article directories and they will provide good information.
Digg is good for general link submit StumbleUpon is good for anything remotely viral Reddit is good for anything political in nature or discussion oriented
High page rank article directories are the answer... Go Articles ArticlesBase Article Dashboard Article City Amazines Sooper Articles Idea Marketers Those are all PR 6 or higher, all have do follow (as of last time I checked), adn submission is pretty easy once you're organized...
Prlog.org works well if you publish enough articles that they interlink, then throw some blog comments at the article. we are in poisiton2 in Google for cheap tires with our article.
I like ArticlesBase and GoArticles. This being Ezines is recommended by many. Concerning the bookmarking I use tumblr and mixx.