I'm always amazed by the editable grid.  Everyone wants it, everyone loves it, why wouldn't they....it's just like Excel!  I don't know why, but I always have and always will hate the editable grid.  Grid's are good at displaying information, not editing.  Checkout Chris Stevenson post, "The Editable Grid Antipattern" for reasons why you should always ask 5 why's when someone asks for an editable grid.  Here's to hoping I never see another one in the UI designs for the apps I work on! :)