Working with @ebryn on a particular control that we discovered to be a pretty challenging and interesting problem to solve in EmberJS. Wanted to solve the same problem in AngularJS so we could discuss and draw comparisons. It seems to me at this point in both frameworks the situation is mostly covered, but perhaps requires some wiring that would be unintuitive for the average developer.
A generic table control with templatable columns. Given a data set in the form of an array of objects, we need a customizable table because we need to do things like show/hide columns, sort consistantly, etc.