It seems as if Google is now offering beta Gmail accounts to its AdWords customers. As Doug from Aderit Internet Marketing Consulting points out at HighRankings forum, "Google appears to have launched a program of offering Gmail to it Adwords advertisers. I've received a bunch today offering Gmail to my various Adwords-using clients, starting with the biggest Adwords spenders."
Want a Gmail account? Become a big spending AdWords customer. Just kidding. ;)