A brief addendum to Danny's post about A9's just announced OpenSearch service. When you review the list of databases already available you'll see that A9 has also launched their own weblog search engine called "A9 Top Blogs Search." It currently provides searchable access to, "a constantly updated set of recent blog entries from over three hundred of the most influential English language blogs on the web." I was unable to find a list of what 300+ blogs are being searched or what criteria A9 uses to determine a blogs influence.
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