Squidoo, Hubpages and Gather.

Digg.com Page Rank: 8
Digg.com is a good site for news article marketing. We can upload
videos and podcasts. For working with this site we have to create an
account. After creating account we will have to submit URL of our blog
website along with user name password. After submitting required
information we can start uploading news article, videos and podcasts.
We can get good traffic for the site

Squidoo.com Page Rank: 7
Squidoo is good site for making free blog. We can publish our
articles in blogs that will link to our site. We can get traffic from
this site. Our websites page rank will also be affected in some
positive manner as squidoo‘s page rank is good.

hubpages.com Page Rank: 5
Hubpages.com, a good site here you can easily publish information on a
topic you love to write about. Some good topics are Business,
Supports, technology, travel etc.

ning.com Page Rank: 7
Ning.com is a social networking site. From following features we can
have benefits
Features

* Create blog posts with photos, files, and moods.
* Manage blog posts and moderate comments.
* Choose the option to publish in the future.
* Members can customize their own pages.
* A profile question section where you write the questions.
* A member “chatterwall” for others to leave chatters.
* Option to add widgets to profile page.
* Member photos and videos.

43things.com Page Rank: 7
43things.com, allow us to make Free blog to publish our own articles
that link with our site.

advogato.org Page Rank: 7
The site allow us to publish articles. After having an account we can
publish articles.

asmallworld.net Page Rank: 5
The site allows us for publish press releases and article. Basically
it is a community site; we can share our views with others.

Zimbio.com one of my favorites, little different but offers a lot.

topix.com

http://knol.google.com

I have been searching for some high PR article directories since some days and ultimately I filter out 5 best article submission site. All 5 article submission sites approve article at once and have page rank above 3. But when you submit article do not make spam, than means only put 2 to 3 link on the resource box, otherwise you do not get much value by your article. Below are the four article sites

1. http://www.articleslash.net
2. http://www.fourpxarticles.com
3. http://www.ideamarketers.com
4. http://www.goarticles.com
5. http://www.selfgrowth.com

http://www.socialmarker.com/