IconIDr is an application that enables you to tag and sequentially number the icons within a Mac OS X folder. You can choose your own identifer tag (e.g: "ABC"), how many places to show in the numeric identifier (e.g: "0001") and at which number to start. Your unique identifier is prepended to every icon within the folder you specify. You can also choose to number just files or folders.
IconIDr provides two simple interfaces: drag and drop or launch and choose. It supports processing multiple folders and includes protection to avoid accidentally numbering System folders.