There's an annoying side effect of locking file when it comes to Mac OS X -- there's no fast way to override the state, like option-Empty Trash in OS 9.
Not only does this not exist, but the Finder will report that you do not have "sufficient privileges" to delete the file (which may be correct in a way, but rather misleading since we now have permissions to worry about).
Does anyone know of a quick way to remove file locks from the Terminal or another app? I've tried xFiles 1.0b1, but it doesn't seem to recognize that the files are locked at all.
Mac OS X Hints