Autorename files with identical names when dropping in directory

Autorename files with identical names when dropping in directory

On windows, how can I set up a mechanism so that when I move a file into a directory where a file with the same name already exists, the new file is renamed randomly (or to <>.ext)?
Use case: I'm browsing cheezburger, drag and drop an image into a folder. Problem: all of them are named i.chzbgr.jpg => conflict. Windows offers to replace or not move, not even autorename ...