Here’s a checklist to use as a guide for optimizing your web pages.
INTERNAL / ON-PAGE SEO
[ ] W3C Validated Page Layout
[ ] Keywords in Headline
[ ] Keywords in TITLE tags
[ ] Keywords in META Description tags
[ ] Keywords in H1 Tags
[ ] Keywords in Image ALT tags
[ ] Keywords in first line of content
[ ] Keywords in footer
[ ] Internal linking to relevant pages
[ ] XML site map
[ ] Keyword-rich domain name
[ ] Static URLs
[ ] Original (or customized) content
[ ] Frequently updated site
EXTERNAL / OFF-PAGE SEO
[ ] Keywords in links
[ ] Authoritative / Reputable link sources
[ ] Relevant keywords near links
[ ] One-way links
[ ] Social bookmarks
[ ] PR4+ backlinks
[ ] Backlinks from top directories (DMOZ + Yahoo)
[ ] On-going blog commenting with backlinks on DOFOLLOW blogs
[ ] 20+ new backlinks per month