The wrapping paper has just been torn off that shiny new iPad Air or strikingly svelte iPad mini with Retina display that someone was kind enough to give you for the holidays. And believe me, between the stunning display and the way it feels in your hand, it's going to take a long time for the shine to wear off that new iPad. And yet it's feeling a little empty, isn't it? Like something's missing.Friend, you need to download some apps.Apple makes things easy on that front by keeping a well-stocked App Store. And nearly half of the million or so apps available for download are built specifically for that iPad you're holding in your hands. Still, there is such a thing as having too many choices. After all, you don't want your very first App Store download to turn out to be a clunker. And just to complicate things further, everyone uses their iPad for different reasons, and what's a great app for one person might leave another staring at the Retina screen in uncomprehending horror. I