I don't link to other blogs much and I also generally don't like loooong blog posts. But Ed Stetzer has a post on Preaching and Plagiarism that I thought was pretty groovy.
A couple of years ago I heard Don Carson speak at SMBC and he told us how he rebuked a preacher for plagiarising stuff - Don Carson's stuff. I can't think of anything more frightening than being confronted by the Don, can you?