I think it's an optional for all publishes, have a look in your Adsense settings screen (sorry I can't give you specific instructions as I'm not near a computer I can use to log on at the moment).
Never noticed that, I see Onsite Advertiser Sign-Up Under the "My Account Section" You can untick it after hitting edit
Yep, that's the way to do it. Keep in mind that after you change this option it can take up 48 hours for the "Advertise on this Site" link to be removed from the Adsense blocks on your site(s). That info isn't published anywhere that I could find but that's what I was told by a Google rep when I went throught the process for a site a few weeks back.
Yeah, there is that option. But it doesn't remove the "advertise on this site", at least not for me... ...
1. Log into your Adsense account. 2. Click the "My Account" tab. 3. Scroll down to the "Onsite Advertiser Signup" section. 4. Click edit 5. Uncheck the box next the working "Include me in Onsite Advertiser Sign-Up" 6. Wait up to 48 hours for the "Advertise on this Site" to be removed from your site.