I just wrote a tut on preventing getting Click bombed, it has worked for me I hope it works for you. They are not proven methods, but instead they are just tips that i've gotten from different web owners. Here are the tips on preventing click fraud them. If you have a suggestion for me to add, then feel free to post it, and if you don't like something then please make sure you do constructive criticism. Thanks.
Theres no real way to prevent getting click bombed, because anyone can just do it whenever they want.
not really usefull, there are no tips how to prevent them, thats just "How you will know when youre doomed"
Beside, it doesn't matter anymore. Google will just stop the earning for that particular site at that paricular moment...
Yeah and when that happens you'll be suspended/frozen. I'm not saying that this are "the" methods to prevent them, they are just tips. If you keep a close watch on your visitors you'll know their rutines and thereby know when you are getting click bombed.
It happened to 3 of my sites. 50 clicks for 3 impressions. Earning: $0.00 Google saw it, that's all... No need to email them...
There is nothing new in the tips, may be good for newbies. Added one more unique visitor to your stats!
Although these are known to most of the webmasters, the way you've presented the things fascinated me... ALL THE BEST!!!