Everyone that writes—even a simple email—needs to proofread. Just take a minute or two and re-read what you have typed before you hit 'SEND' on that email. For a brochure, advertisement, or book, you should consider using a professional proofreader, like my friend Bill Dinardo (aka, 'Billy the Proofer'). Save yourself some embarrassment: Proofread!
PS: If you find any typos on my website, let me know!