Most adsense publishers fear that they might click on their own ads, which will result in termination of their contract with Google. Accidental clicks ere a real problem for me too initially, until I found out some simple, cool tricks, which made my life more easier.
To start with, Michael Hampton from Homeland Stupidity has developed a script, which will prevent publishers from accidentally clicking on their own ads. If you decide to go this route, you need to have Firefox with Greasemonkey extension installed. Once you have Firefox and Greasemonky insalled, you’ll have to download the script and install it.
Once done with the installation of the script, visit your website which has AdSense ads in it. A popup box will bounce up asking for your AdSense Publishers Code (You can find your publisher code at the bottom of ‘My Account’ in your AdSense Account’s Dashboard, which looks something like pub-xxxxxxxxxxxxxxxx).
If this sounds too complicated then you can also block Adsense ads using the Hosts file. Open “lmhosts” file with any text editor and add the loopback address, as shown below:
127.0.0.1 localhost
You can find the “HOSTs” file in is located in c:\\windows\\system32\\drivers in Windows NT and XP. In Windows 9x, the HOSTS file is located in c:\\windows.
If you still feel you clicked on your own ad by mistake you can report it to Google at this page.