These new specialty engines (verticals, if you like) appear to allow the searcher to search topic-focused portions of the main Gigablast web database of more than two billion pages. I hope to spend some time checking these new resources out over the weekend. If you're not familiar with Matt Wells, here's a very interesting "conversation" about Gigablast and web search in general between Matt and Steve Kirsch that was published last year in ACM Queue.
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