+heading
+Bi-line - ie, two sentences that introduce the content of the article and serves as a purpose to engage the responder to read the whole article
+Written like a newspaper article
+Consider carefully your audience: an intellectual audience will be adressed in a formal style of writing, a computing consumer would expect to see "computer jargon" in their articles, teenagers would most likely to be adressed in a colloquial manner - though it is best that you do write in a formal register
+Use lots of repetition, alliteration, allusions, anecdotes, similies, exxageration/hyperbole and other language techniques as this engages the responder to read on
The best thing for you to do is to buy the sunday paper and the sunday magazine is filled with feature articles that you can look at and get some ideas. Read each one, annotate it and notice how they all follow the one structure but only differ to cater for a certain audience.