Blogging traffic is a give and take relationship. Sometimes one of the best ways to get traffic to your blog is by visiting someone else 's blog.
Go to their blog and read one of their entries, or read a few of them. Chances are that you are going to find something that you have in common.
When you find something that you find truly interesting on a blog, leave a comment so that they know that you were there.
One of the best known blogs available is LiveJournal. A great feature of LiveJournal is that you can search for interests on their site and it will come up with results of those who have that interest.