Yahoo clicks aren`t clicking

Today I got a call from one of my clients asking me to check stats with him as he is seeing certain discrepancies in Overture reports. We went in and figured that the number of clicks reported by Overture roughly 3 times larger then what is being reported by AWstats. Upon contact, Yahoo/Overture issued a statement that basically says “your software is badwe know better”. Alright, we thought, and ventured to check on Google. The result was astonishing – the difference was 0.6%. Either Google is very good at serving ads that are traceable, or Yahoo/Overture isn’t being honest. Or both.