[BillyMac]

Here are the 2007-08 IAABO, not NFHS, mechanics changes:

Added a signal (spreading of the arms) for when a defender is not in a closely-guarding position.
Referee can delegate jump ball toss.
Ball allowed on floor during time-out or intermission.
Boundary line coverage by trail farther sideline above free throw line extended.
Trail may rotate toward farther sideline, leads primary coverage area rotates.

There's also an exception to the "boxing in principle (official-ball-official)", but we're not using this here in Connecticut.