I recently bought a Palm VIIx. If you use a word once to mean one thing, avoid using it again to mean something else. In headings and bullet points keep syntax consistent, but not at the expense of clarity. Use terminology consistent with industry standards. Proofread for consistency, not just for typos, inaccuracies, and misspellings.
Consistency is also important in site architecture, design, and navigation.
But I'll address that another time. Consistency is not just for trains and dead people. Strive for it in your writing. She has written and edited copy for more than a dozen major sites and has played key roles in redesigning five of them. Prior to Vertebrae, she was Senior Web Copywriter and Editorial Manager at Getty Images, the world's largest international provider of digital imagery and film.