I could give you tons, but here are my favorites!
1) Keep it short. 500 words or less per page, newsletter, blog post, etc. will almost always tell your story sufficiently.
2) Avoid corporate speak! I’m on a crusade to rid the world of overused words/phrases like “impactful,” “end of the day,” etc. Check out our full list here: http://www.brilliantink.net/blog/?p=26
3) Know your audience. The better you understand them, the better you’ll communicate with them.
Check out more writing tips on our blog: http://www.brilliantink.net/blog/?p=339.