Technorati - What's This?

I was just trying to use the Technorati search engine and without even typing in a search string, I got this message:

Sorry
We couldn't complete your search because we're experiencing a high volume of requests right now. Please try again in a minute or two. We're working hard to make our search results better. Thanks for your patience.

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I have often wondered why we need a search engine focused purely on blogs when Google and Yahoo can give us everything. If Google and Yahoo allowed a flag of "blogs only" and provided the kind of market research on blogging that Technorati reports, I think Technorati would become irrelevant. Error messages may accelerate that process.