aristotle - 7:22 pm on Jul 26, 2011 (gmt 0)
So the evolution of SEO, is offering you visitor the best user experience you can come up with.
When I created my first webiste in 2004, I knew almost nothing about SEO or link-building. So I simply tried to create the best site I could for my expected visitors. This was a non-commercial site about an environmental issue, and for the first year or so, it got less than 10 visitors per day. (For a long time it only had one backlink, which was from from DMOz).
But now most of its pages rank number 1 in Google for their title, even ahead of the corresponding Wikipedia page in some cases. I've never changed the basic design and the only link-building I've ever done was some submissions to free directories, which I no longer do. So I think the main reason for its success was my original intent to make the best site I could for visitors.