If you haven’t considered using a site like Pay Per Post, I would certainly look in to it. I have now used this service twice in the past few weeks, spending about $100 each time. The second time I was able to get 16 blog posts written for $105 in all. Each post was positive in nature, included links with the keywords I required, and were on semi-established to well established blogs, many with PR and good content.
The possible downside and negative talk about these services is that search engines aren’t going to value these paid posts like they would other content and people have also been down on the fact these are basically paid advertisements, feeling the bloggers should disclose such. I don’t care to get in to that and it really doesn’t matter to me either way at this point. I just know that getting 16 blogs writing about my product, service, or website for $105 is a pretty good deal.
I also was talking to another Earners Forum member a few weeks ago who said his ranking for the keyword he was targeting with his Pay Per Post reviews moved up several pages in Google. Not very concrete, but we could definitely be on to something here.