Checked out double recall, seems interesting but at the same time it seems like a combination of in-line text ads and interstitials. I am sure it will catch people's attention having to type in a product name or words related to a product but I believe that will only annoy potential customers.
I think it will to, depends on your value proposition, I see it working for an article I want to read because the minor inconvenience is worth it for the article. If what your producing is fairly low quality and available everywhere you will drip away a far larger % of users.
