Cool that somebody started an article on that. Just by coincidence I also made my experience with Suspend2 tonight. I will add details I discovered soon (NVidia stuff, Sound stuff).
As for the possibility of executing the script as a user: Couldn't the permissions of the hibernate script be changed so that members of the "power" group (seems to exist by default) can execute it.
Anyone tried out Gnome Power Manager already - does it play nice with the hibernate scripts?