Your post is very informative and I am sure this will be of great help to the internet marketers. The warriors also will benefit from the information.

To be it is SEO

must be high quality and unique content
this better than "Content Should Be Simple to understand ?"
because you are talking about the promotion of a website
when discussing content, if you have this, traffic will come easily and quickly

CMIIW

Anyone should definitely read seo beginner's guide at Seomoz.org before designing a website.

Yea, you forgot one main point which was already mentioned. Other than that, that is what should float on everyone's mind when building a site.

Here I am given some basic elements for website promotion:
1. Link building
2. Articles and Social Media
3. By writing E-book directory.
4. Forums and blogs
5. Offline marketing
6. Classified advertise