There is big check list whenever deals in SEO and Webmarketing

Domain and URLs

Domain Age
Redirection: Site.com redirect to www.
Keywords use in domain
No underscores in filenames
At least registration for domain for 5 years
site should works in multiple browsers
Displays Logo & company name clearly on the website
Clean, clutter-less design
Low usage of animated graphics
Targets intended audience
Easy to navigate all services or products pages
No horizontal scrolling on the website
Contact no. should appear on the site
use skip on flash
Pages formatting
Site should works in variety of resolutions
Correct robots.txt file
Declare doctype in HTML
Validate HTML
Don't use frames
Alt tag usage on images
Custom 404 error page
Robots.txt non-user pages
Nofollow non-important links
Validate CSS
Check broken links
Page size less than 50K
Proper site hierarchy
Title reflects page info and heading
Proper bulleted list formats
Minimal use of tables
Links to Home page
No new window links