One of the myths of article writing is that you need to write a perfect article before you can start writing.
While it's true as a solopreneur or service professional, your reputation and credibility depends on how you present yourself to the world, there's no such thing as a perfect article.
Spelling and grammar are two other important elements.
You don't want people to think that you can't type or don't care about spelling.
In my opinion, a few errors here and there are acceptable especially if it's in the medium where you rush over the content and don't have much time to check it.
For instance, you're live blogging from an industry event.
Writing may be concise and to the point and if you write from a Blackberry or Pocket PC, there may be some typos.
Those are exceptions though.
Writing style, although no standard can dictate it, is also crucial.
However, being an expert in one field doesn't mean you must be perfect in writing too before you can be an article author.
You can't improve without doing.
Everyone has to learn to walk before running.
The same thing applies to writing.
Get to certain level of proficiency in writing and show it to the world.
Know that it will become better in the future.
Perfect articles don't exist.
The information is the articles, as long as they are useful to the readers, can be very valuable.
Information about how to find a secret map where you could find a treasure is certainly worth more than the paper or even toilet tissue it was printed on.
If a stranger who can't speak English knows how to get me out of the jungle when I lost my way, I won't wait until a fluently speaking friend come to save me.
So, get writing anyway.