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technorati.com has tags which you can include on posts, which can give you a few hits depending on how busy and well-read the tag category is.
blogwise.com is also a pretty good one.
quacktrack.com is the largest, though the method of getting listed is complicated: you have to get listed on blogshares, then players can vote your blog into up to 5 categories.
You can't go wrong by setting u your blog software to ping services like weblogs.com and technorati. :)