1.Canonical Issues – check canonical issues to make sure there is a preferred default page or domain preference (http:// or www).
2.Indexation and Crawl Frequency – See how many pages are crawled in a site to determine crawl frequency.
3.Orphaned Pages and Dead Ends – check for orphaned pages to determine if pages are linked sufficiently to ensure crawling.
4.Dynamic URL’s – If pages are dynamically created, try to remove or rewrite as many parameters in the URL as possible or use URL / Mod rewrite.
5.Naming Conventions – Use proper naming conventions (subject or keyword first, then plural variation, modifier, then tag line).
6.Manage Outbound Links – Try to cap outbound links per page to fewer than 50 links for larger pages (10 for top level pages that need more ranking factor).
7.Footer / Site wide Links – Use footer links sparingly by tactfully to tie site segments together.
8.Broken Links – Check for broken links which could be hemorrhaging link flow and weakening a site from within.
9.Alt Attributes in Images – Use alt attributes on images to preserve content integrity while providing internal links for ranking factor.
10.Anchor Text Optimization – Use pertinent anchor text and do not waste link equity from excessively linking to non reciprocating pages within a site.
11.Flattening Site Architecture – Keep site architecture as flat as possible or use breadcrumbs to aid in information architecture and crawling.
12.Content Volume – Ensure you have enough content to topple a competitive keyword.
13.Contextual Links – Link contextually within related document to select preferred landing pages through virtual theming.
14.Meta Tags – For larger sites, exclude meta descriptions but for smaller sites, use the meta data as an extra title or place for alternative keywords.
15.Deep Links – Get at least 5-10 inbound links to each page via deep links from other sites in order to create buoyancy.
16.Keyword Stemming – Link to a page with multiple anchors (to create keyword stemming) and with “exact match” keywords to elevate just that term.
17.RSS Feed Syndication – Set up multiple RSS feeds within a site to syndicate your content to attract natural backlinks from other sites.
18.Trust Rank – Linking from aged pages can pass along trust to new landing pages or sub folders or sub domains. Don’t look past your own site for ranking factor.
19.Sitemaps – Use sitemaps to not only tie the site together, but also as a way to nourish pages like an irrigation system through linking to them.
20.Sub Domains – Despite abuse in the past, sub domains still work.