The storyboard tag (333 questions) is currently used in two sets of questions that have little or no intersection. WPF and Silverlight apparently have classes by that name used to manage animation. At the same time, Xcode 4.2 and iOS 5 introduced a storyboard concept (and a UIStoryboard class) that's used to manage view controllers. Both draw inspiration from the storyboard concept used in movie making, but the uses are otherwise not related -- someone interested in iOS development wouldn't care about questions tagged with 'storyboard' related to WPF.
There are already two questions tagged uistoryboard, so one possibility is to retag questions with both storyboard and ios as uistoryboard. Another possibility would be to create storyboard-ios, storyboard-wpf and storyboard-silverlight.
Finally, we could leave storyboard alone and use it for all things storyboard-like.