This is a geeky post about Linux so please ignore it and move along if the subject is not to your liking. OK.. still with me? It seems it's all kicking off over on the Fedora Core mailing list with the release of Fedora 12 and the discovery that an undocumented "feature" exists whereby any user can install packages on the system without being root.
Frankly it is kind of strange that Fedora would put something like this in as it's a little bit of a "Microsofty" approach. If you;re running a multi-user system is really sensible to allow anyone to install whatever packages they like (as long as they're digitally signed)? Personally I say no.
Anyhow, the thread is a good read.