TutorialBlog has a good article: 7 Things You Should Know About Web Writing
It discusses some essential thinking that should go into writing for web.

Including:
Reading onscreen is hard on the eyes - Use one third the number of words for onscreen as you would in print.
Keep blocks of copy short-
About half your readers will [...]

Entrepreneur.com’s Mark Stevens recently wrote an article entitled Sales and Marketing: Separated at Birth - I believe his intention was to discuss how one is nothing without the other, not sure he succeeded.
He writes:

The question arises from the fact that most marketing people dislike salespeople. They don’t understand selling and, even worse, have a disdain [...]

I recently finished Bill Tancer’s new book - “Click: What Millions of People Are Doing Online and Why It Matters”. It’s a real look into Bill’s day-to-day job which gives him almost instant access to the American zeitgeist.
As General Manager, Global Research at Hitwise, a search intelligence company, Bill has truly unprecedented access to insights [...]