Would an incoming do follow link matched with an outgoing nofollow link be equal to a one way backlink? Or would this still be seen by G as reciprocal? I was thinking about making favorable posts about reputable related sites and then asking for them to do a similar favor in return. Assuming that a fair amount of them wouldn't be diligent enough to check if it's do follow, this would give you one way links from high PR sites in a seemingly equal trade. My site has a high PR so I think this might work pretty well. I imagine you would need a site with lots of traffic and/or a high PR to make these sites interested in "exchanging".