Found an interesting article in Writer's Digest from Karen Dionne, author of Freezing Point. She lays out what she believes were Michael Crichton's top 5 writing lessons for fiction.
In reading them I was struck by the fact that all good writing, including blog posts should be written with these 5 lessons in mind. Here's how I think they apply to blogging:
1. Challenge your reader: This is always a must. Wake people up with new concepts and ideas. Your blog is a great place to try out new ideas and let readers respond.
2. Surprise your reader: Keep her entertained and don't always go for the cliched ending. That means sometimes you'll even surprise yourself.
3. Keep the clock ticking: Don't be boring. Say what you have to say - no fluff or filler.
4. Get your facts straight: Always. Take the effort to research if you aren't sure.
5. Play fast and loose with the facts: Well, not really. Don't forget he was writing fiction. But the point that's paramount here is the idea of story. Screenwriter Robert McKee said that a memorable story 'unites an idea with an emotion." Be memorable.