01– Ignoring the Title tag

02) A Flash website without an html alternative – or using flash at all for important website components (navigation, descriptions, Call to Action

03) JavaScript Menus

04) Website Lack of consistency and maintenance

05) Using only Images for Headings (without ALT Tags)

06) Ignoring URLs as a factor

07) Backlink spamming

08) Concentrating TOO much on meta tags (set it and move on)

09) Targetting the wrong keywords (Too competitive, or no search value)

10) Lack of keywords in the content