emacs 23.1 drag and drop in mac os x
Carbon Emacs opened a file in place when you dragged and dropped it over a frame.
Emacs 23.1 by default inserts the content of the file.
To change it back you need to do the following in your .emacs file:
(custom-set-variables
'(ns-pop-up-frames nil)
... other settings
)
(global-set-key [ns-drag-file] 'ns-find-file)