I guest posted on
Making Money Online by Milking the Internet - John Cow dot Com and got a tone of relevant visitors that converted into members here.
Alan Lest a member here did a guest post for
I Make Money Online by Telling People How Much Money I Make Online - John Chow dot Com and mentioned us just in normal text. "bloggeries" was searched like crazy for a day or so.
It's definitely worth it. Don't be selfish and give some of your BEST material away. By doing so you get visitors to see your best work. Why keep it on a blog no one visits? Use it to grow!