The most important thing is to have compelling content that truly makes your site valuable in itself and as a recognized resource for others to link to. In the "old days" when they were a lot fewer web pages and you didn't have the famous "Google page rank algorithim you could trick out the site easier with keywords, descriptions and pretty much the useless and infamous "link page."

One reason the who concept of "blogging" has reached the mainstream so to speak is you are creating interesting content that other find useful and come back to. One thing that is very important is the use of certain keywords within blog posts.

If you have images remember to use decriptive file names and alt tags.

It all boils down to content, compelling content, descriptive content.