This is going offtopic but i’m still interested in what you have to say.
In terms of page rank I know it does not matter from where the link is comming from.
But if I have a link from yoursite to mysiteA with the text “keyword1 keyword2” it’s better than having a link from mysiteA to mysiteB with text “keyword1 keyword2”. I’ve always been under the impression that links have more weighting (in terms of SE ranking not PR) than if the link came from my own site.