Moving an object to the top of a folder listing
As whizzy as Plone 3's AJAX drag-and-drop folder re-ordering is, it's fairly unusable when you have a large number of items and need to move an item from the very bottom to the very top (or vice versa).
Doing a little AJAX debugging reveals that the heavy loading of this drag-drop functionality is actually done by a simple skin script, folder_position.py, which you can actually pass all manner of arguments into.
Moving an item to the top of a folder as as easy as calling the aforementioned script on a folder, passing 'position' as 'top' and 'id' as the id of the object you want to move e.g.
http://mysite/myfolder/folder_position?position=top&id=banana
You could also pass in 'position=bottom' to move it to the bottom.

