I don't know if you know about that, but it is possible to get a free blog post absolutely for free.
The site Merfins.com is giving a posibility to get a blog post on their site absolutely for free.

You will get a dofollow links on PR2 blog at this time.

The way how to do this:

• Register on this site
• Login
• Go to Posts>Add New
• Add your article with up to 3 links to your sites
• Wait till your article will be approved

I think that is really great way to get free backlinks to your site.