As we move more and more toward “all things Google,” it might surprise people to learn that Google’s Gmail was, until recently, mired in 4th place among email vendors. That’s where it was until new comScore estimates for July 2009. Yes, despite the way Gmail and Google Docs, and Google Reader, and the rest all work together, it’s only now that Gmail edged past AOL Mail, with 37 million unique visitors compared to only 36.4 million for AOL. Who’s number two? That’s Windows Live Hotmail, with 47 million unique