This question has been answered to death and a quick search of the forum will tell you what you need to know. Having said that, here is a brief rundown:
1. Find like minded bloggers and leave comments on their sites.
2. Join blog directories. There are tons of them out there.
3. Submit your feed to RSS directories. Again, there are tons of them out there.
4. Join social networking sites like Facebook, Twitter etc.
5. Make use of social bookmarking sites like Digg etc.
6. Join forums that deal with your niche in particular and blogging in general. (such as this one)