It could be any range of blogs; it's one of the most effective and least-used means of marketing.
Say I'm a bowtie company that sells to designers; I could look for all the fashion blogs by searching "bowtie" or "necktie," etc. Just generic blog outreach, whether it's little blogs or mommy blogs, would be very useful. Not only do you get some traffic from those blogs, but you get the link juice of some really good links.
