My 2 cents:
Use some smart link dropping techniques leaving your link on other blogs in the same niche by commenting on their topics. You can buy links on other blogs too (on blogs in the same niche as yours), since having your link appear on each page of the blog is better than having it appear on just one (the page where you've posted a comment with a link to your blog).
Always make sure you aren't being a spammer because other blog owners won't like it. However, you can use your spammy techniques on other spammy blogs but don't ruin the cleaner ones.