How many sysadmins (all with root access) should we have? 4 seems like about the right number. It would be nice if we could somehow pick admins with good spread across the different time zones, to give us more times when one is likely to be awake and able to handle emergencies.
It might be nice for each sysadmin to have brief "office hours" each week, where he agrees to be on IRC answering questions and helping people in real time.