When one of our blogs started out as a Blogger blog, we had a page rank of 3. Over time the blog evolved and we bought a domain name for it because we thought it more appropriately fitted the direction.
Paula followed Googles instructions in putting in the redirect to the new domain. We thought misguidedly that the PR would transfer over to the new domain name. Unfortunately that didn’t happen and we lost our page rank of 3.
So the question here is, did Google penalize our site for duplicate content since we had both the blogspot and the new domain name running concurrently? If so then Google really needs to do something about it since they have so kindly provided the option for blogspot owners to use their own domain name. At the very least Google should advise users on what they should do to reduce the duplicate content issue.
Since the duplicate content issue was a concern we transferred the blog to WordPress and trashed the old Blogspot blog.