Based on a comment to How to write well I answered:
My own top writing tip would be to write about what you are passionate about and to let the passion show. When someone combines passion and knowledge almost any topic is worth reading about.

Skellie writes about “How to Write Like a Painter” where she picks a painters way of working and applies it to writing.

Once you have an idea for an article it’s relatively easy to work out what you want to say. It’s the how that trips us up, so often causing writer’s block. We’re trying to paint a masterpiece in the first sweep, when every great masterpiece grows from very humble beginnings.

Anna Goldsmith has a guest post at Copyblogger about Five Easy Steps to Editing Your Own Work. Editing can be boring but is needed to make things as correct as possible.

DailyWritingTips has a post with 34 Writing Tips That Will Make You a Better Writer. It is a useful collection of tips from readers. I like this one:
Learn the rules of good writing… then learn when and how to break them.

Brian Clark at Copyblogger writes about How to Use the “Rule of Three” to Create Engaging Content.

You see the Rule of Three used all the time across diverse areas of life. Why? Because information presented in groups of three sticks in our heads better than other clusters of items.

DailyBlogTips has a guest post by Mike Smith about The Art of the Follow-Through: Every Great Headline Needs an Even Better Opening Paragraph.

You should be using your headline as an attention grabber and something that’s going to sting when hit with it, or in the blogger’s case, it should grasp the reader’s attention. Your introduction paragraph should be a combination of punches that really rock the reader and stop them from moving forward to the next website.

Mike rounds off his post with “The knockout blow: The final paragraph”.

If you write well you want to be seen, Leo Babauta has a post at Copyblogger about Go Big or Go Home: Why Being Bold is Critical to Getting Noticed.

Do you sometimes have a problem with getting started? Check out Ready, Set, Write! at DailyWritingTips.

One of the biggest problems people have with writing is getting started. A blank page (or computer screen) can be intimidating, but prewriting is a great way to overcome that intimidation.

This was originally posted at another (now extinct) blog of mine.