Is there any way to permanently reject Mac updates that are not relevant to one's operating system? I'm referring to non-essential updates for applications that I don't own or use such as MobileMe. Other than selecting the "not now" option, there doesen't seem to be a way to permanently reject unnecessary updates that only take up space on the hard drive and, because I have no intention of using these applications, serve no purpose whatsoever. Unfortunately, these unwanted updates always return during future updates, and the "not now" option is a temporary solution at best. Thanks for any tips.