DON'T design your web site exclusively for graphics navigation, with no text links at all. Forcing your web site visitors to load graphics will alienate some visitors. Watch out for designs that require a mouseover to "uncover" something important. Don't make your web site visitors "work" to get your information.
Fix: Keep it simple and direct. Use conventional technologies and web protocols.
DON'T confuse your site visitors. Don't hide important info like products, prices, how to order, and contact information.
Fix: Keep your navigation clean and simple.
DON'T forget to submit your web site to Google, Bing, and other search engines you may use.
Fix: Tell all the search engines about your web site.
DON'T forget to add people and company / organization information to your web site. Your web site must be personal. Don't be faceless, nameless, and anonymous. Don't be a mystery company. Have some personality.
Fix: Add personal company and employee information to your web site, blog, and other locations on your web site.