Would agree with this article 100%. If I'm honest, most of the top 100 music blogs in the world probably won't even read your press release unless it's from one of the big PR / publicist companies that are known for pushing already established acts. Within the blogosphere, the 'long tail' phenomenon also exists. At the head of the curve is where all the big sites lie and as you go down the tail, this is where all the remaining sites sit where there is less competition. Another area to explore is foreign music sites who have an interest in your genre. I discovered that a lot of musicians don't have the time to research all of the smaller music sites, so I've been working on a series of guides hich highlight the top 500-600 music sites for each genre around the world. If you fancy a peek head over to http://styleofsound.com.