As for the original article, it was published in the Spring 2007 issue of Pennsylvania History. I can't link directly to the article here, but if you'd like to read a version, please just shoot me an email.
An update on me: I'm now working on my dissertation, which examines the effect of African slavery on Christianity. I'm focusing on the Quakers (surprise!), the Anglicans and the Moravians in the early modern period (17th-18th century). I'm trying to figure out why the majority of organized religions accepted slavery and created theological reasons for accepting African slavery.
I've started a companion blog to my dissertation, which can be found here - please check it out!