I have a couple article directories. People always email me asking to buy links. I always just delete their emails. Lately, i've been thinking this would be another revenue stream. Is there like some "service" / "broker" that I go to if I want sell links on my website? I have heard that such places exist but have never looked into it. Also, I have adsense on my sites, and I heard that "selling links" (without the NOFOLLOW attribute) was frowned upon by Google... ideas. Thanks!