I'm making this a sticky topic because every Adsense Publisher needs to be aware of this information.
In Google Adsense anyone can sabotage your account if they copy your Adsense code onto a page they control and start clicking on the ads with your publisher ID on them. I've been having this problem for the last few days, and I've tried contacting Google about the issue but I found out there is a way you can prevent this sabotage from happening to you.
All you have to do is change your account settings from "Allow any site to show ads for my account" to "Only allow certain sites to show ads for my account".
See this article on my Affiliate Programs blog for more information...
I haven't seen this article before but it is very good to read for all Adsense publishers. Is there a way to prevent invalid clicks from children in the house or family/roommates sharing your ip from clicking on your ads ?