QUOTE(arendick @ Jan 8 2013, 12:12 PM)
Why do article post and Blog post ? Please share your views...
Aritcles and blogs are good source of content based link building. Blogging is full of features like graphics, themes etc while article sites supports simple but powerful link building.
Article's are needed to be informative and promotion free where in blogs you can promote anything.
I think both are important as a part of off site SEO.