Hey, iPad owners! This one's for you. iPad apps tend to be more expensive than their smaller-screened counterparts, but luckily they go on sale just as often. This week we found iPad apps for making comic-book heroes out of you and your friends, apps to give you a reason to haul your trusty iPad to meetings, and a game that lets you take over the world. And you can get all of 'em for less than the price of a six-dollar burger...