Wisdom gleaned from different webmaster forums about finding the right keywords for your website:

"KEI is a measure of search frequency combined with number of pages competing. Its not how many are in the fight that matters - its WHO is in the fight. KEI tells how many but not who.

I look at KEI but don't let it decide what terms I will target. If I allowed an unfavorable KEI to scare me off of keywords I would be acting like a whipped dog and never accomplish anything less than easy.

Good read on Wired David Sifry, founder of Technorati, giving a few tips like:

React quickly. Commentators like Andrew Sullivan and Michelle Malkin draw megatraffic with immediate rebuttals to A-list pundits at The New York Times and Fox News.

and

Thanks to Gary the Scuba Guy from SEO Chat Forum for this:

Social Bookmarking

Wikipedia defines it this way:
In a social bookmarking system, users store lists of Internet resources that they find useful. These lists are either accessible to the public or a specific network, and other people with similar interests can view the links by category, tags, or even randomly. Most social bookmarking services allow users to search for bookmarks which are associated with given "tags", and rank the resources by the number of users which have bookmarked them. Many social bookmarking services also have implemented algorithms to draw inferences from the tag keywords that are assigned to resources by examining the clustering of particular keywords, and the relation of keywords to one another.