We don't need every app in the iTunes App Store to make the hop over to the Google Play Store, but there are a few that droid users clamor for more than most. Some we're going to get in the near future, but others are still stubbornly sticking to iOS. Make some noise for your favorites in the comments.
At first I didn't understand the appeal of Instagram even though I own a Lomo camera (that I haven't used in years). Making your pictures look fuzzy and old? Now that I've started testing cameras on smartphones and tablets I'm starting to get it more. Even less than great images can look fine with some nice photo filters.