I'm the new Managing Editor at H+ magazine, which in practical terms means I need to come up with five good articles a week to publish. The magazine gets a lot of traffic so it's a good place to share information with other transhumanists.
1. Come up with an idea or coverage of a company/product/news story worth covering. Ideally you have had personal experience with the company/product/news story and are uniquely suited to write about it. If not, you should be ready to quote someone who has.
2. Send the pitch to email@example.com. That goes into my inbox. Include links to samples of your other writing. (If you want to write articles for H+ magazine but haven't written serious blog posts yet, you might want to try that first.)
3. If you get the go-ahead, investigate the story, get a quote from an expert in the area you're writing about. Take notes. The article should primarily be reporting, not speculation or personal opinion. Editorials are welcome but harder to write than straightforward informative articles. If you do want to insert a little speculation, save it for the end.
4. Write the article. Between 500 and 1000 words is ideal. The less experienced you are at writing, the shorter and more concise it should be. Follow Singularity writing advice. Omit needless words. Remember the Most Important Writing Rule. Most likely, what you write will be boring not because you're stupid, but because you aren't bending over backwards far enough to please the audience. Make each sentence matter.
5. Use the inverse pyramid structure that is common for all news and magazine articles. The five Ws come first: who, what, where, when, and sometimes why and how. Then, the most important details of your story. Why should we care? That should be answered within two or three sentences of the beginning. Why is reading this article worth the reader's precious time? Why should I read this article in my free time instead of going hiking, visiting the beach, or reading something better-written? If your idea isn't good enough to occupy the reader's time, don't bother.
That's it! Follow these simple guidelines, and your article will be accepted and you will become famous overnight. Within the transhumanist community, anyway. :)