This is the number one skill you need today.
Internet is all about content. If you can't write well, you will have to work hard at developing this skill.
There is lot of writing going on, and most of it is too verbose or not well written.
Who does it well?
A good place to turn to besides reading good writers is copyblogger.com blogs. I think they got it figured out.
But how do you develop it? Copyblogger has a very good blog that unveils the secret of writing in "10 steps to become a better writer."