eBusinessmap

This list is incredible. Reading through forums is okay but this list has it all with no searching.

As a summary this is these are the major factors for

On-Site SEO:

Good Factors-
1 - Keyword in URL - First word is best, second is second best, etc.
2 - Keyword in Domain name - Same as in page-name-with-hyphens. DON’T_USE_UNDERSCORES! *Note - As of this month
3 - Keyword in Title tag - Keyword in Title tag close to beginning - Title tag 10 - 60 characters, no special characters.
4- Keywords in H1,H2, H3 tags
5- Site Age

Bad things on your pages to avoid:
1- Over optimization penalty
2- Linking to bad neighborhoods
3- Excessive crosslinking among sites with the same c-class (or sites in general) Use this tool to check c class
4- Keyword stuffing (Don’t cram every keyword under the sun in your Meta tags and in the body)
5- Hiding or being sneaky with keywords and web pages (Cloaking, same color text of the background.
6- Changing a page too often too much.
7- Imbalance of code to text ratio.

Off-Site SEO:

Good Factors-
1- The anchor text of inbound links coming into you. When building your inbound links try to get your keyword phrase as the link. Example: Buy Small Dog Clothes here VS Buy small dog clothes here. Be CAREFUL with this though. Just like the Over Optimization penalty too many links saying the exact same thing can hurt you.

2- Age of link - If you buy a link or get a link on a page make sure its there forever. If you have links going up and down or changing anchor text Google will frown at you.

3- Link from Expert Sites