tedster - 5:43 am on Apr 18, 2011 (gmt 0) [edited by: tedster at 6:21 am (utc) on Apr 18, 2011]
One change has been major advances in semantic processing. We used to need to shout our keywords over and over to register some relevance. Today, content can be written in a much more natural fashion and still rank.
[edited by: tedster at 6:21 am (utc) on Apr 18, 2011]