Thanks for your tips. But I think nowadays we have to do some research to check whether certain topic of article or keywords are having strong competition over those ezinearticles.com and goarticles.com. Some time I go there and found that many articles are almost same. Some of them just slightly with different headlines and writing style. But the main points are almost same. What do you think?
Make your own content, they will rank better that way if they are unique.