InLinkz link parties can help you build your incoming links by requiring backlinks from your entants to your blog.
Through the required backlinks feature, you can force your readers to add a direct link that points from their site to yours.
This backlink acts as a good referral from other blogs so it is beneficial to your pagerank.
To require a backlink, click to expand the +Advanced options, while creating or editing a link party.
Enable the "Require back links" option.
Once you enable it, the blog(s) you want your readers to point to will be displayed. You can set or change your blogs from your Settings > My Blogs.