To do this, I often align the launch of my content with a couple of guest posts on relevant websites to drive a load of relevant traffic to it, as well as some relevant links. This has a knock-on effect toward the organic amplification of the content and means that you at least have something to show for the content (in terms of ROI) if it doesn't do as well as you expect organically.
Monster-Traffic is another traffic exchange, though it’s initially a little off-putting due to the 1995-style website. It’s a free for all styled advertising list, where anyone signing up becomes part of the audience and an advertiser at the same time. You sign up and you can enter a link into their system, and that link is added to a roster that is send out to every member of the group. Additionally, registration allows a free solo ad; an ad that isn’t drowned out by other advertisers in that mailer.