People enjoy their iPads, e-readers and other tablet devices, and the devices are changing the way people interact with content -- they are increasingly being used at the expense of time spent on laptop or desktop computers, a recent Google study finds. The company's mobile advertising network AdMob conducted the study of 1,400 "tablet" users in March (almost all of whom would have to be iPad or e-reader users, as few competing non-ebook tablets have yet sold very well) and presented the results in a PDF slideshow published on their Mobile Ads blog.