There’s an article that I found years ago on Slate.com called “How we read online.”
The article discusses how internet users read the internet, and how writers need to tailor their writing to this new medium.
Cam and I (who run MusicianWages.com) get a good number of emails asking to guest blog for our site. We have a lot of rules for our guest bloggers (the biggest one: no self-promotion).
At the end of the rules, I always point the writers to this Slate article and ask them to try to follow as many of the rules as they can.
It’s a great resource. I recommend it to anybody who frequently writes online.