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From their site: Technorati is the recognized authority on what is happening on the World Live Web, right now. The Live Web is the dynamic and always-updating portion of the Web. We search, surface, and organize blogs and the other forms of independent, user-generated content (photos, videos, voting, etc.) increasingly referred to as citizen media.
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Add in favorites blog.
API key there is, username and password there are.
Simon, try some API libraries for Technorati written in PHP:
duck soup (http://www.kailashnadh.name/ducksoup/)
Janet Kellman, [url=http://rbytes.net/software/]software reviews[/url]