I would really enjoy using an arcpy function which could allow me to create a new and/or add to a bookmark file (.bkmx). The listBookmarks class in the mapping module is useful IF you already have bookmarks, but if they don't exist yet and you have to manually create them, that can be a bit of a bear. Ideally I'd want something I can pass parameters to like scale, Name, etc... This would make using it with a cursor fast and easy. And it would be super great if I could use it in Modelbuilder with iterators too (i.e. to iterate through a dataset as i would in a cursor loop, pull those values from the row, and plop them into the bookmark parameters). Who's with me?!