I use Adlogger. Now you have to be very careful here as Adlogger will register an Adsense click if a visitor has their mouse cursor over one of the ads for a certain time period (Something I was told when I first began using it). I believe in your Adlogger logs, it will show as "About xxxxxx" where xxxxxx is the name of the Ad. I've had Adlogger warn me about multiple clicks when all it turned out to be were 2 "About xxxxxx" and 1 actual click
Now how many you need to set it to, it depends (I am still changing mine depending on traffic volume). 4 clicks is a good place to start off with