The main pieces of evidence that Shigesato Itoi is an awesome guy, of course, can be found in the trio of quirky-yet-poignant RPGs he made for Nintendo systems between 1989 and 2006 known as Mother, Mother 2 (aka EarthBound) and Mother 3.
Another such morsel of proof just popped into my conscience, though, thanks to the stellar Yomuka! blog--with that morsel being that Itoi and his colleagues at Hobo Nikkan Itoi Shinbun (Almost Daily Itoi News) have a tradition of "celebrating the release of every Animal Crossing game by turning office-wide gameplay into an actual work project."
Not only that, but pretty much every employee at "Hobo Nichi," as Itoi's company is called, maintains a blog about their experiences. Check them out by visiting 1101.com and then clicking on the heads of each staffer (scroll down to the bottom of the page). If you only want to see Itoi's Animal Crossing: New Leaf blog, go here.