Technorati's Dave Sifry is presenting the latest stats on blogs at the Web 2.0 conference. Some interesting nuggets: The number of blogs is still doubling every five months, as it has for the past 36 months, and there are no signs yet of slowing. About 55% of them are still active three months later. About 8% of new blogs, however, are spam blogs--most of them in China.

Technorati also launched a new feature today: the ability to search within blogs tagged with specific words. Tried it out for a bit, and the results do weed out a lot of, well, weeds.

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