Alex is very passionate about his work and I respect and agree with his thoughts on linking for credit:
Hyperlinks are the dendrites of the Internet. Hyperlinks are like a retweet on Twitter: they’re both social currency. Linking up the source for news story or fact with a link is like footnoting a research paper, except that it both helps the reader learn more and provides credit and authority to the site linked. Neither mainstream media nor blogs should be lifting stories without linking in 2011. So stop.
via Alex Howard