"This…cat may be an internet sensation, but he knows how to keep his celebrity status from going to his fluffy head…mostly…See all his favorite hiding places—trash cans, cupboards, cereal boxes…if it’s cozy, he’s there—meet his treasured toys, and learn what it means to wield just the right amount of cat-titude."
I am Maru will be available August 23, 2011, but if you can't wait until then, his blog of the same name updates frequently.
Link
Maru has 2 books out here: http://bookweb.kinokuniya.co.jp/guest/cgi-bin/wshoseaohb.cgi?KEYWORD=%82%DC%82%E9%82%C5%82%B7%81%42&AREA=02