What works best for me is connecting with influencers. Make friends with people in and out of your niche. It will come in handy beyond traffic.
nce you have connected with them, start linking to them in posts "link love". If you do this, let them know about it, and they will share your posts on twitter, facebook etc.
They have large audiences, so this will help.
I've gotten tweets from Spencer at NichePursuits, John at EOF, and plenty of others.
Just make friends