When you write about a topic that invokes emotion in yourself, it shows. Your writing will flow more naturally, while your enthusiasm for the subject will affect your readers in a positive way.
If your article deals mostly with basic facts that many people already know, it may seem unappealing. Dig deep into your research to find interesting and surprising facts, quotes, pictures and videos. Try Wikipedia, Youtube, Flickr, Google, Yahoo, and/or Altavista.
Think about your audience. While you don't have to write about celebrities and current events, you also shouldn't pick a subject that no one has heard of, unless you can deliver relevant reasons to interest and entertain your readers. Take your topic's popularity into account, and try Google Trends to help you decide.
The subject shouldn't be so limited that you can cover all of its aspects in one paragraph, but it shouldn't be so broad that a good article won't provide enough information to cover the relevant points.
Readers on the Internet tend to ignore large batches of words in long paragraphs. Break up your writing into easily readable paragraphs.
The title and the first line of the article should catch your readers' attention. The last few lines of the article should summarize your thoughts and leave them entertained and satisfied. Make sure you keep your readers' interest by limiting your introductions and conclusions to a sentence or two.
Your reading audience is waiting for your article to improve their lives, make their days, and give them something interesting to think about and discuss. Make your words and sentences strong, clear, and direct.
In order to write articles with a clear message, you must know for whom they are intended. While you are writing, try to form a picture in your mind of the ideal readers and imagine what they would want to discover about your topic.
In order to do that, a quality article should have a beginning, a middle, and an end. Declare your intentions in the beginning, cover the main points of the topic in the body, and draw a conclusion at the end. Don't just jump into a list without explaining why it is interesting and worth reading. You can even hint at surprising facts or quotes.
If you find pics or videos that add to the value of your article, use them. If you find some interesting links to your topic, include them. If your article has connections to current events or well-known persons, discuss them.