Make custom iPhone ringtones work with iTunes 7.4.1

Last week there was an update to iTunes (7.4) – this allowed you to make your own ringtones by simply renaming your files with a .m4r extension. Within a day Apple released 7.4.1, the update killed that, but now you just need to rename them back to m4a. This reminds me of when Sony tried to stop firmware hacks on the PSP – Link.