There are most of the Article site provide Nofallow link only few of article provide dofallow link. I found some site they are providing dofallow link. goarticles.com/ sooperarticles.com/ ezinearticles.com/ Are any one have some more website?
in fact, Egine and sooperarticles.com fast back link maker sites and do follow also, I am giving you here also do follow list http://login.a1articles.com http://www.ezinemark.com http://www.submithealtharticles.com/ http://www.fourpxarticles.com http://www.manipalonline.com http://www.isnare.com http://www.internetwebportal.com http://my.articleslash.net http://www.everyonesarticles.com http://www.s-article.com http://www.thewhir.com http://www.site-reference.com http://articledirectory.com http://www.articlecircle.com http://www.tipbus.com
Do follow links are that links that pass their link juice on the other hand no follow dont pass link juice. in Seo do follow links have too much importance and helps in good ranking
In simple words, dofollow are those links which are identified by google. You can check for dofollow links of your website by typing "link:[yoursite.com]" in google without quotes.
I think its better to submit articles in high pr sites such as ezinearticles, goarticle, articlebase. Because, google will crawl these sites first and if it finds your article in another site, then it will identify it, even if its pr is high.
Ya these all are popular article submission websites.. Dofollow means search engine crawler count as back link which gives more boost to your keywords to improve ranking..