Google's Achilles Heel
gigaom.com
gigaom.com
edit: And Google lets you narrow your search by industry, etc.
As with other "hidden" features of Google, I found it by simply "telling" Google what I was looking for: "jobs"
That is what I believe is the Achilles' heel of this analysis.
Large companies dominate the share of the whole market, small companies dominate niche markets.
Here is an example: MSDN library search versus Google site search on MSDN library site. Google is better, presumably because they take into account all external sites linking to MSDN. Never mind they don't know specifics about site format or contents.