Why is this ? At first I thought: hey, other users can write my files, but then I noticed my user is in a separate group (username steven, uid 500, groupname steven uid 500). Can anyone explain, since I've never seen anything like this before and don't really see what is could be for ? (Note: not sure I filed this for the right component, but I had to take a guess).
The default has always been one user per group. Google and the mailing lists may be more helpful here.
The only thing I could find so far was just 'red hat uses one-user-groups by default', but I still don't understand why that is. Doesn't this make the whole groups-thing useless ? If there is an official explanation for this on the mailing lists somewhere and someone has a direct link, that would be nice, since I'm not too skilled at searching them (and this is the first time I've ever used Red Hat of Fedora full-time).
http://www.redhat.com/archives/redhat-list/2002-March/msg01753.html has some information/discussion.
Also <http://www.google.com/search?q=user%20private%20group>
Thanks for all the info :)