For those who would rather save a few dollars and not use a Public Relations / Marketing professional (such as Stanley Hurwitz), follow these  tips to improve your communication skills: 

• Verbs HAS to agree with their subjects.

• Prepositions are not words to end sentences with.

• And don't start a sentence with a conjunction.

• It is wrong to ever split an infinitive.

• Avoid clichés like the plague. (They're old hat.)

• Also, always avoid annoying alliteration.

• Be more or less specific.

• Parenthetical remarks (however relevant) are (usually) unnecessary.

• Also too, never, ever use repetitive redundancies.

• No sentence fragments.

• Contractions aren't necessary and shouldn't be used.

• Foreign words and phrases are not apropos.

• Do not be redundant; do not use more words than necessary; it's highly superfluous.

• One should NEVER generalize.

• Comparisons are as bad as clichés.

• Don't use no double negatives.

• Eschew ampersands & abbreviations, etc.

• One-word sentences? Eliminate.

• Analogies in writing are like feathers on a snake.

• The passive voice is to be ignored.

• Eliminate commas, that are, not necessary. Parenthetical words however should be enclosed in commas.

• Never use a big word when a diminutive one would suffice.

• Kill all exclamation points!!!

• Use words correctly, irregardless of how others use them.

• Understatement is always the absolute best way to put forth earth-shaking ideas.

• Use the apostrophe in it's proper place and omit it when its not needed.

• Eliminate quotations. As Ralph Waldo Emerson said, "I hate quotations. Tell me what you know."

• If you've heard it once, you've heard it a thousand times: Resist hyperbole. Not one writer in a million can use it correctly.

• Puns are for children, not groan readers.

• Go around the barn at high noon to avoid colloquialisms.

• Even if a mixed metaphor sings, it should be derailed.

• Who needs rhetorical questions?

• Exaggeration is a billion times worse than understatement.

• Proofread carefully to see if you any words out.

(This list is not original. I would give proper credit but could not identify the author to give proper credit.)