How turn off update notifications? (F17)

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http://forums.fedoraforum.org – Can someone explain how F17 checks for and then sends a notification that updates are available? I want to disable/remove that whole mechanism. It's really annoying. It looks like it may have something to do with PackageKit, but I am unsure. I tried "yum remove PackageKit", but that's gonna remove a whole lot of other stuff. Basically, I don't want PackageKit to ever run/exist. I'll settle with not being notified, but even then, I've remembered in the past, PackageKit disallowing yum from running... which is another annoyance I want to take care of. (HowTos)