Register your blog with Stumbleupon and Technorati. Stumbleupon will get you lots of visitors, but not a lot of comments, and hardly any ad clicks. Technorati will get you more comments.
Plus, a lot of bloggers give stuff away to get comments. They will post on Twitter that they are giving away something, and to register, you only have to comment on that post. Gets a lot of traffic and a short term Google boost.