A list of search engines for blogs:

BlogPulse is an automated trend discovery system for blogs and a portal
into the world of blogs.

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Feedster

Supports returning results in xml

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Technorati - Technorati provides search and notification services for
active content on the World Live Webtm. We monitor over 1.8 million
sources (weblogs, RSS) with over 10,000 new sources added each day, all
with a median index update time of under 9 minutes.

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Blogdigger

Supports returning results in xml

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Blogdex - Blogdex is a research project of the MIT Media Laboratory tracking the diffusion of information through the weblog community.

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Daypop - Search 59000 News Sites, Weblogs and RSS feeds for Current Events and Breaking News

Supports returning results in xml

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The latest, the greatest?

Pubsub - The service monitors over one million weblogs and information
streams to find the content you’re looking for, in real time.

API etc supported

NOTE: http://www.pubsub.com/elections/ (!)

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Power Laws, Weblogs, and Inequality

The Blogosphere Power Rankings — The Most Popular Political Blogs On The Net

Weblog links do follow a power law
This saturates less quickly than other media, due to low barriers to entry. Therefore the many lightly linked weblogs outnumber the few heavily linked ones.