Why does the 'find' program run when waking from sleep?

Since installing Leopard, I've noticed on a number of occasions that the 'find' program runs for about 5 minutes after waking the my intel iMac from sleep. This program takes up about 50% of a cpu core and thrashes the hard drive. I've seen another intel iMac do this as well. Any idea what's going on, or if this is supposed to happen?