With Article Writing you increase your pagerank.

If you write an interesting article related to the products or services of your website, you can quite easily get One Way Backlinks to your site. In these articles, you put up to 3 backlinks to your own website. These links are pointing to your website and are thus One Way Backlinks, very fine for Google. Article directories live from advertising and need contents for their readers. You deliver the content through your articles.You provide them with reading material in which they are very interested. more..Backlinks bekommen(German)

If you deposit your article to a category which is related to the contents of your site, you obtain good backlinks. Because of this it is significant to properly classify the written articles. You obtain One Way Links with a high pagerank, if you write articles to well known article directories such as Ezine.com etc. . But only attractive and well written articles are accepted from those Article directories.

Because of two reasons the published articles should have a “unique content”. If you get links from identical articles, Google would treat them as spam. Article directories want to bring out new articles and not copies of old ones. The article directories verify the articles for unique content, otherwise the article is rejected. If they find out that there are new articles which are very similar to your submitted one, they remove the links in your article. more..viele Backlinks bekommen mit Artikel Marketing(German)

So, do I have to write many articles if i want to increase my pagerank? The answer is yes. This can be very time consuming. For the best article directories you should be sure that your articles are unique and that you are the writer. For many other article directories, the articles may have a certain similarity. By using synonyms and by changing the sequence of the sentences or paragraphs you can create several articles from one original article. Because the article should still be readable don’t overuse the synonyms. A tool that helps me much in writing and delivering you find here. Viele Artikel automatisiert versenden(German)