I just ran a PPC campaign in Goclick (now run by Marchex Adhere). While I'm watching the referrals on my landing page, I see referrals coming from porn sites in addition to other places I'd expect on the Goclick network. When I checked into it, they said someone was forcing clicks through my Goclick campaign but didn't know how. That blows. Don't think I'll ever be using Goclick again. Any suggestions for PPC alternatives?