3 second delay... (in my case)
This also happens on my MBP 2.33gHZ. Before my OS completely crashed it happened at all times. After I reinstalled Tiger and then upgraded to Leopard, it worked great for a time. I just noticed yesterday that the delay happens again. It may coincide in my case with the installation of a BootCamp partition, but I'm not sure about that. I wonder if it has anything to do with disk space. My disk is now just over 50% full. One of the Apple geniuses once told me that for best performance of the MBP in general, it is recommended to keep the disk no more than half full. I find this VERY irritating.
BTW: i have run Disk utility, verified the HD and repaired permissions without benefit.