Hey, I always wondered if having a linkback that popped up in a new window lowered the effectiveness of the link e.g. <a href="http://www.domain.com" target="_blank">link</a> is that a less effective link than: <a href="http://www.domain.com">Link</a>
No, I don't think so. The target parameter is only used by browers, and search engines will ignore it.