Blogger Help : Promoting Your Blog: "Be an active commenter. Try to leave comments on the blogs you read every day. This is in the same vein as linking. Leaving a comment on someone's post can make their day. Nothing beats getting those email notifications that whisper tacitly out at you from the screen, 'You're thoughts have struck me dead in my tracks. I simply must acknowledge you and your greatness.' (Or something to that effect.) Most comment systems also provide a way for you to leave a link back to your blog which begs a visit at the very least. So if you feel inspired, leave a comment or two in your blog travels. It behooves you.
Pitch your posts via email to other bloggers. This is a touchy technique and should be approached with caution. Blogger Eugene Volokh has published a short treatise on how best to pitch one's blog via email and it's filled with great tips and advice. Assuming your blog is actually worth pitching (of course it is), here are some tips from Volokh.
1. Pitch the post, not the blog.
2. Include the full text and your URL.
3. Submit only your best posts.
4. Don't only pitch to high traffic blogs."
Since I mentioned this is something I'm going to start working on, I thought I'd share this helpful advice for increasing traffic to a blog.