Here is a great piece from Kurt Vonnegut about writing, it has gems such as:
William Shakespeare and James Joyce, wrote sentences which were almost childlike when their subjects were most profound. "To be or not to be?" asks Shakespeare's Hamlet. The longest word is three letters long.
The whole article can be found here.
In summary, the key points made are:
1. Find a subject you care about.
2. Do not ramble, though
3. Keep it simple
4. Have guts to cut
5. Sound like yourself
6. Say what you mean
7. Pity the readers
And here is a little ad from Amazon with one of Kurt's well known book, Slaughterhouse Five