In E-Zine, you can submit good quality content, and be regular with your process of submission. After your article is reviewed, it will be published, if found genuine. It will help you fetch good traffic.
I was just reading an article that said that if you post content to an e-zine site, and it is indexed, when the same material is indexed else where or on your site, you will LOSE rank! This worries me. Also most sites just change links into "no-follow" links which aren't what we want.
Definitely ezine is good for SEO(search engine optimization),
it is an article based site where you put your article in order to increase the back links or as well as traffic. but your article & its keywords should be unique or powerful (full or good contents).
Ezines are viral and allows long lasting links as long as you don't get yourself banned. Using article marketing you can actually build significant links specially from article directories that have PR 5 and above.
I am daily user of Ezine i am just talking about my experience ezine is very useful and trusted article directory and mostly people give importance to ezine article and information so ezine is very effective for promoting business although it is very difficult to get approval of your articles there but overall very effective.