New login shells will have the new group setting. If you want to do a quick test, you can open a terminal, and switch to your own user using "su - yourusername". It seems a little odd to switch to the user name which you are already using, but the - option makes the new shell a login shell, and it should have the new group setting inside that shell.
This is a time saver if you use a graphical login, and you want to try out a new group setting without completely logging out and back in again.
Last edited by matthewg42; 11-24-2007 at 11:32 AM.
Reason: I am muddled :)