Lost track of Google’s M&A binge this year? No problem: The company helpfully tallies it up for investors in its most recent quarterly filing. The big picture: Google has spent at least $1.6 billion buying 40 companies during the first 9 months of 2010. And if you assume the previously announced ITA deal goes through this year, you can tack on another $700 million. Google breaks out a few of the bigger deals: Slide: $179 million AdMob: $681 million (thats right from the iphone) On2 Technologies: $123 million 37 other companies: $626 million Bear in mind that these numbers very likely underestimate Google’s real M&A cost, since they don’t include big employment contracts it hands out to keep key talent it picks up. Slide’s Max Levchin, for instance, is going to do very well as a Google engineer for at least a couple of years.