[richarme]

In my school's case it was 'passwd'. No cracking needed to obtain that one though, the admin had it written on a post-it on his monitor.

[stordoff]

My school's domain admin password was 'school' (later changed to the school's name with O->0 substitution). It's marginally better than their VNC password though, which was 'vnc' (VNC Server was installed on every machine in the school).