Dear Kovid,
Would it be too much to request for "delete this format" button in a book? It can be added now by converting.... but deletion is not.
By the way, last year you added the "Clear" button to date field, but it doesn't actually clear the field. The Book Details page still shows "Published: [blank]" rather than omitting it altogether. I synced the library to my PC (I do this less and less often now) to see the reason: The date value became 101.00.00 (or close to that value) rather than "Undefined".
