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Other mentioned engines are surprisingly Teoma and Gigablast. Not AlltheWeb, AltaVista, or Inktomi.
Most of the article is the "beware, Google is powerful" dealy and privacy issues, largely from the google-watch.org guy.
As to the 104,000 pages not all being indexed, which other search engine does?
It's fleeting, and could change over night. The trick would be anticipating the new trends and staying on top of them.