I have tried a new man on box behind this year . D is man on in the corner , center ( or supporting forward ) stays in " the house " . If the puck is passed away from the d the SF goes
and yells " I'm out " the d now skates to the support location and yells " i'm in " . I have found that having two players in the corner causes a lot of problems when one of them get beat out of the corner .
It looks like there are lots of drills in the files section with topics on practices to teach individual defense and team defense. Also there are videos with drills in the video section.