Student arrested in grade change hack

I saw this linked from Drudge.
A High School Class President, who also holds the student seat on the Broward County (FL)School Board has been charged with two counts of computer crime with intent to defraud, a second-degree felony.
As part of his School Board job, he was given a laptop in order to access job related email. He found the I.T. specialist had a sheet of username/password combinations on his desk. The student used the purloined passwords to access the counties system for tracking grades and modify grades for several students.
The obvious lesson is not leaving passwords on a sheet of paper on your office desk.